WASHINGTON -- The first bang sounded distant and muffled. On the fourth floor, Bertillia Lavern assumed somebody downstairs was setting up for an event and had dropped a folding table.

But when the bangs kept coming, Lavern recognized the sounds.

Years earlier, before taking a civilian office job at Naval Sea Systems headquarters, Lavern was a Navy medical specialist. Known as a corpsman, she'd been on training operations with the Marines. She knew the snap of gunfire.

The 39-year-old hit the ground and scurried under a desk with her supervisor in a nearby cubicle, she said. They stayed there silently as the shots continued.

From that vantage point, the building's open floor plan allowed her to view the fifth floor, where she saw someone moving.

"Get down!" she screamed, emerging from her hiding place.

She remembers her supervisor, Andy Kelly, making the same demand of her. And she remembers a bright flash of light.

"Glass shattered right by my head," she told The Associated Press in a phone interview on Thursday. "It was on the edge of Andy's cubicle."

Lavern's account is the most detailed yet by someone who was inside the Navy Yard when former Navy reservist Aaron Alexis, a contractor who had worked at the Navy Yard for less than a month, shot and killed 12 civilians on Monday before being killed by police.

Lavern said she and Kelly ducked down again and waited for a break in the shooting.

"We realized then we had to get out of the building," she said. "Andy looked around the corner to check that the coast was clear."

Lavern crawled to her desk to grab her identification badge and her purse. From there she saw her colleague, Vishnu Pandit.

"He was down."

Pandit, 61, had spent 30 years with the Navy. Known to his coworkers as Kisan, he had two sons and was a grandfather and lived in North Potomac, Md. He was the first person she greeted at the office each morning. And he had been shot in his left temple.

Using tissues from his desk, Lavern pressed her hand against her friend's head. She held him there and prayed over him.

"I felt him breathe," she said.

She felt for his pulse. Amazingly, it was strong.

She turned to Kelly: "We need help now!"

Kelly ran for help and Lavern stayed behind, she said. She did not know where the gunman was.

"Stay with me," she said. "I'm right here."

She told him that God loved him, that his friends loved him, that they wanted him to stay with them.

"We don't want you to go," she told him.

Three security guards arrived. They carried Pandit to an office chair, rolled him to the stairs and strapped him into an evacuation chair used to help disabled people quickly escape.

But it wouldn't roll.

"We lifted, dragged the chair down the stairs."

At every floor, she said, she checked his pulse. It remained strong.

When they got to the second floor, she said, the security guards' radios came to life: "The shooter was on the first floor," she said. "On the west side."

Exactly where they were heading.

They continued downstairs and escaped through a side door, where she said they found a security guard in an unmarked car.

A gunman was on the loose and the security guard was worried about leaving his post. Still, he took Lavern and Pandit into the car and raced off. They made it off the grounds of the Navy Yard and to a street corner a few blocks away. The security guard needed to get back to his post and asked police who were there to get an ambulance immediately.

Lavern eased her friend to the pavement. His pulse was gone.

Across the street, James Birdsall was having his morning coffee in his office on the 11th floor at Parsons, an engineering company. As he and his colleagues watched the police cars screaming toward the Navy Yard, Birdsall noticed a man lying down on the street corner below at New Jersey Avenue and M Street.

Birdsall assumed someone had had a heart attack. His company had trained him to use a defibrillator but the man was all the way across the street and there was already a woman giving CPR.

"But I thought, `If don't do this now, I'm going to look back and say I should have,'" Birdsall said Thursday.

So he grabbed the defibrillator and ran. The 11-floor elevator ride seemed to take especially long. The run through the lobby and across the intersection remain a blur.

Birdsall knelt at Pandit's head while Lavern pumped at his chest. That image was among the first to surface from the Navy Yard shooting Monday in a photo that was taken by congressional staffer Don Andres and circulated on Twitter by Tim Hogan, a spokesman for Rep. Steve Horsford, D-Nev.

Almost immediately, there were questions about what it showed. Was it really a shooting victim? If so, how did he get blocks from the scene? There was speculation that someone had a heart attack, unrelated to the chaos blocks away.

But Birdsall saw the gunshot wound to Pandit's head. He attached the defibrillator's two pads to the man's chest.

The machine said not to administer a shock, Lavern said. So she continued giving CPR.

Others came to help and Lavern kept talking to her friend. Birdsall could tell that from the way she kept saying his name that she knew him well.

Within two minutes of being dispatched, an ambulance arrived. Lavern asked to go to the hospital with him but a detective told her she needed to give a police report instead. She removed Pandit's badge and gave it to rescue workers so they would know who he was.

The Associated Press had distributed two photos Andres took on Monday but hours later withdrew the photos until it could be verified they were related to the Navy Yard shootings. The AP reissued the photos along with this story.

Pandit was pronounced dead on arrival at George Washington University Hospital, where Dr. Babak Sarani, the hospital's director of trauma and acute care surgery, called the injury "not survivable."

Lavern, a mother of one from Stafford, Va., attended Pandit's funeral on Thursday.

"He was a good friend," she said. "He was the sweetest man."

Her husband, Navy Lt. Cmdr. Randall Lavern, said he wasn't surprised at her actions.

"That's my wife," he said. "She's always the one running to help."

___

Associated Press Writers Ben Nuckols and Jessica Gresko contributed to this report.

Loading Slideshow...
  • Navy Yard Shooter Alleged Suspect Aaron Alexis

    UNKNOWN, UNSPECIFIED - SEPTEMBER 16: In this handout photo provided by the FBI, Aaron Alexis is shown in a photo prior to the mass shooting at the Washington Navy Yard on September 16, 2013 in Washington, D.C. Authorities believe Alexis was a gunman involved in the shootings at the Navy Yard, where at least 12 people were shot and killed. (Photo by FBI via Getty Images)

  • Family and friends wait to greet staff of the Naval Sea Systems Command headquarters as they are bused from the Washington Navy Yard to Nationals Park, in Washington, Monday, Sept. 16, 2013. At least one gunman launched an attack inside the Washington Navy Yard, spraying gunfire on office workers in the cafeteria and in the hallways at the heavily secured military installation in the heart of the nation's capital, authorities said. (AP Photo/Jacquelyn Martin)

  • US-MILITARY-SHOOTING

    Police conduct an investigation into a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage Monday at a US naval base in the heart of Washington claimed at least 13 lives, including the unidentified gunman, while another possible suspect was still at large, police said. The shooting sparked a massive show of force as police and federal agents surrounded the Navy Yard, cordoning off streets only blocks from the US Capitol, home of Congress. US officials gave no indication of any link to terrorism while police said the motive for the attack on the naval installation was unknown. 'At this hour, it appears that we have at least 12 fatalities,' Washington DC police chief Cathy Lanier told a press conference. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

  • Nii Oti-Ankrah, left, kisses his wife Sally Appiah-Ankrah as he holds their son Eilam Ankrah after she was evacuated from building 197 at the Washington Navy Yard, Monday Sept. 16, 2013 in Washington. At least one gunman launched an attack inside the Washington Navy Yard, spraying gunfire on office workers in the cafeteria and in the hallways at the heavily secured military installation in the heart of the nation's capital, authorities said. (AP Photo/Alex Brandon)

  • An officer who said he works for the Department of Defense, right, checks an id outside of the closed Washington Navy Yard in Washington, on Tuesday, Sept. 17, 2013, the day after a gunman launched an attack inside the Washington Navy Yard on Monday, spraying gunfire on office workers in the cafeteria and in the hallways at the heavily secured military installation in the heart of the nation's capital. Only essential personnel were being permitted inside, according the authorities. (AP Photo/Jacquelyn Martin)

  • Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

    WASHINGTON, DC - SEPTEMBER 16: Family members of Navy Yard complex employees gather outside a parking lot that was converted to a point of reunion at Nationals Park in the wake of the Navy Yard shooting September 16, 2013 in Washington, DC. Police believe at least one gunman shot and killed 12 people and wounded others in an incident that put parts of the city on lockdown. (Photo by Win McNamee/Getty Images)

  • Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

    WASHINGTON, DC - SEPTEMBER 16: A woman hugs her child while reuniting at a gathering point for family members of Navy Yard employees that was set up inside Nationals Park in the wake of the shooting September 16, 2013 in Washington, DC. Police believe at least one gunman shot and killed at least 12 people and wounded others in an incident that put parts of the city on lockdown. (Photo by Win McNamee/Getty Images)

  • US-MILITARY-SHOOTING

    A Red Cross vehicle arrives at a family gathering point for the Navy Yard shootings set up at parking lot B of Nationals Park on September 16, 2013 in Washington, DC. A shooting rampage Monday at a US naval base in the heart of Washington claimed at least 12 lives, including the unidentified gunman, while another possible suspect was still at large, police said. The shooting sparked a massive show of force as police and federal agents surrounded the Navy Yard, cordoning off streets only blocks from the US Capitol, home of Congress. US officials gave no indication of any link to terrorism while police said the motive for the attack on the naval installation was unknown. 'At this hour, it appears that we have at least 12 fatalities,' Washington DC police chief Cathy Lanier told a press conference. AFP PHOTO / Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

  • US-MILITARY-SHOOTING

    A woman steps out of a bus which arrived at parking lot B of Nationals Park which has been set up as a gathering point for families of the Navy Yard shootings on September 16, 2013 in Washington, DC. A shooting rampage Monday at a US naval base in the heart of Washington claimed at least 12 lives, including the unidentified gunman, while another possible suspect was still at large, police said. The shooting sparked a massive show of force as police and federal agents surrounded the Navy Yard, cordoning off streets only blocks from the US Capitol, home of Congress. US officials gave no indication of any link to terrorism while police said the motive for the attack on the naval installation was unknown. 'At this hour, it appears that we have at least 12 fatalities,' Washington DC police chief Cathy Lanier told a press conference. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

  • Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

    WASHINGTON, DC - SEPTEMBER 16: Family members of Navy Yard complex employees gather outside a parking lot that was converted to a point of reunion at Nationals Park in the wake of the Navy Yard shooting September 16, 2013 in Washington, DC. Police believe at least one gunman shot and killed 12 people and wounded others in an incident that put parts of the city on lockdown. (Photo by Win McNamee/Getty Images)

  • US-MILITARY-SHOOTING

    A US marine guards the entrance of a garage building oposite the US Navy yard on September 16, 2013 in Washington.A shooting rampage Monday at a US naval base in the heart of Washington claimed at least 12 lives, including the unidentified gunman, while another possible suspect was still at large, police said. The shooting sparked a massive show of force as police and federal agents surrounded the Navy Yard, cordoning off streets only blocks from the US Capitol, home of Congress. US officials gave no indication of any link to terrorism while police said the motive for the attack on the naval installation was unknown. 'At this hour, it appears that we have at least 12 fatalities,' Washington DC police chief Cathy Lanier told a press conference. AFP PHOTO/MLADEN ANTONOV (Photo credit should read MLADEN ANTONOV/AFP/Getty Images)

  • A small group holds a candle light vigil on Freedom Plaza to remember the victims of the shooting at the Washington Navy Yard, Monday, Sept. 16, 2013, in Washington. (AP Photo/J. Scott Applewhite)

  • US-MILITARY-SHOOTING

    Police cars are parked outside Navy Yard following a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage Monday at a US naval base in the heart of Washington claimed at least 13 lives, including the unidentified gunman, while another possible suspect was still at large, police said. The shooting sparked a massive show of force as police and federal agents surrounded the Navy Yard, cordoning off streets only blocks from the US Capitol, home of Congress. US officials gave no indication of any link to terrorism while police said the motive for the attack on the naval installation was unknown. 'At this hour, it appears that we have at least 12 fatalities,' Washington DC police chief Cathy Lanier told a press conference. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

  • US-MILITARY-SHOOTING

    Police work as they investigate a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage Monday at a US naval base in the heart of Washington claimed at least 13 lives, including the unidentified gunman, while another possible suspect was still at large, police said. The shooting sparked a massive show of force as police and federal agents surrounded the Navy Yard, cordoning off streets only blocks from the US Capitol, home of Congress. US officials gave no indication of any link to terrorism while police said the motive for the attack on the naval installation was unknown. 'At this hour, it appears that we have at least 12 fatalities,' Washington DC police chief Cathy Lanier told a press conference. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

  • Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

    WASHINGTON, DC - SEPTEMBER 16: Family members of Navy Yard complex employees gather outside a parking lot that was converted to a point of reunion at Nationals Park in the wake of the Navy Yard shooting September 16, 2013 in Washington, DC. Police believe at least one gunman shot and killed 12 people and wounded others in an incident that put parts of the city on lockdown. (Photo by Win McNamee/Getty Images)

  • US-MILITARY-SHOOTING

    Police conduct an investigation into a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage Monday at a US naval base in the heart of Washington claimed at least 13 lives, including the unidentified gunman, while another possible suspect was still at large, police said. The shooting sparked a massive show of force as police and federal agents surrounded the Navy Yard, cordoning off streets only blocks from the US Capitol, home of Congress. US officials gave no indication of any link to terrorism while police said the motive for the attack on the naval installation was unknown. 'At this hour, it appears that we have at least 12 fatalities,' Washington DC police chief Cathy Lanier told a press conference. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

  • Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

    WASHINGTON, DC - SEPTEMBER 16: A Park Police helicopter carries a sniper to the roof of a building on the Navy Yard complex where a shooting took place early this morning September 16, 2013 in Washington, DC. Early reports indicate that several people may have been shot, and police are still trying to determine the number of suspects involved in the shooting. (Photo by Win McNamee/Getty Images)

  • Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

    WASHINGTON, DC - SEPTEMBER 16: Atlanta Braves first baseman Freddie Freeman enters Nationals Park, where a staging area for familes involved in the Navy Yard shooting were instructed to gather, and where the Braves were scheduled to play the Washington Nationals September 16, 2013 in Washington, DC. Police believe at least one gunman shot and killed 12 people and wounded others in an incident that put parts of the city on lockdown. The baseball game tonight has been canceled. (Photo by Win McNamee/Getty Images)

  • US-MILITARY-SHOOTING

    Police tactical units leave after responding to a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage at the Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. 'We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured,' she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

  • US-MILITARY-SHOOTING

    Members of the military look out from a nearby building toward police units responding to a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage at the Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. 'We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured,' she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

  • US-MILITARY-SHOOTING

    Police tactical units leave after responding to a shooting at the Navy Yard in Washington, DC, September 16, 2013. A shooting rampage at the Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. 'We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured,' she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

  • US-MILITARY-SHOOTING

    Unidentified people are seen on September 16, 2013, outside parking lot B of Nationals Park which has been set as a gathering point for families of the Navy Yard shootings in Washington DC. One gunman has been killed and up to two more may still be at large after a shooting rampage at the US Naval base in Washington on Monday that left 'multiple victims' dead, the city's police chief said. 'We have one shooter that we believe involved in this that is deceased,' said Washington police chief Cathy Lanier. 'The big concern for us right now is that we potentially have two other shooters that we have not located at this point.' AFP PHOTO/MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

  • US-MILITARY-SHOOTING

    An unidentified woman is reunited at the family gathering site outside parking lot B of Nationals Park, which has been set as a gathering point for families of the Navy Yard shootings in Washington DC on September 16, 2013. The shooting rampage at a Washington naval base claimed at least 12 lives including that of an unidentified gunman, city police chief Cathy Lanier told reporters Monday. Lanier said two more potential suspects were still at large after the shooting at the Washington Naval Yard and that the motive of the shooter or shooters was not yet known. 'We are confirming 12 fatalities. We had a few additional victims who were injured. They were not fatally injured,' she said, briefing reporters on a street by the base. Lanier gave more details on two male suspects seen near the scene of the shooting, a headquarters building within the riverside base, who police are hunting. AFP PHOTO/MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

  • US-MILITARY-SHOOTING

    Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing 'multiple' victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. 'We believe there were multiple deaths,' a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported.AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

  • US-MILITARY-SHOOTING

    A US Park Police helicopter patrols over the US Navy yard September 16, 2013 in Washington, DC. At least one unidentified gunman opened fire at the US Navy Yard in Washington on Monday and was at large after killing 'multiple' victims and wounding several more, officials said. Police and FBI agents descended on the area in force as helicopters swarmed overhead, amid reports a shooter was armed with an assault rifle and was holed up at the complex. 'We believe there were multiple deaths,' a US defense official, speaking on condition of anonymity, told AFP. The precise death toll remained unclear, the official said. A Washington DC police officer and another law enforcement officer had been shot while the gunman had allegedly barricaded himself in a room in a headquarters building, media reported. AFP PHOTO/Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

  • Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

    WASHINGTON, DC - SEPTEMBER 16: Emergency vehicles and law enforcement stage at the end of the 11th Street Bridge adjacent to the Navy Yard complex where a shooting took place early this morning September 16, 2013 in Washington, DC. Early reports indicate that several people may have been shot, and police are still trying to determine the number of suspects involved in the shooting. (Photo by Win McNamee/Getty Images)

  • Armed police prepare to enter the Washington Navy Yard as they respond to a shooting in Washington, Monday, Sept. 16, 2013. At least one gunman opened fire inside a building at the Navy yard. (AP Photo/Manuel Balce Ceneta)

  • A U.S. Park Police helicopter removes a man in a basket from the Washington Navy Yard Monday, Sept. 16, 2013. Earlier in the day, the U.S. Navy said it was searching for an active shooter at the Naval Sea Systems Command headquarters, where about 3,000 people work. The exact number of people killed and the conditions of those wounded was not immediately known. (AP Photo/Jacquelyn Martin)

  • Police work the scene on M Street S.E. in Washington, where a gunman was reported in a military building at the Washington Navy Yard Monday, Sept. 16, 2013. Shots have been fired and employees directed to a shelter. Police and federal agents from multiple law enforcement agencies responded to the scene and streets in the area were closed. (AP Photo/Jacquelyn Martin)

  • A police boat patrols near the scene of a shooting at the Washington Navy Yard on Monday, Sept. 16, 2013, in Washington. At least one gunman opened fire inside a building at the Washington Navy Yard on Monday morning. (AP Photo/ Evan Vucci)

  • Cathy Lanier

    District of Columbia Police Chief Cathy Lanier briefs reporters on the shooting at the Washington Navy Yard in Washington, Monday, Sept. 16, 2013, where at least one gunman opened fire inside a building at the Washington Navy Yard. (AP Photo/Susan Walsh)

  • Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said.'There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel,' the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

  • Washington Navy Yard

    A U.S. Park Police helicopter flies over a building at the Washington Navy Yard in Washington, Monday, Sept. 16, 2013. President Barack Obama is mourning what he called "yet another mass shooting" in the United States that he says took the life of American patriots. (AP Photo/Susan Walsh)

  • Police Work The Scene

    Police work the scene on M Street, SE in Washington, where a gunman was reported at the Washington Navy Yard in Washington, on Monday, Sept. 16, 2013. The U.S. Navy says one person is injured after a shooting at a Navy building in Washington. (AP Photo/Jacquelyn Martin)

  • A U.S. Park Police helicopter removes a man in a basket from the Washington Navy Yard Monday, Sept. 16, 2013. Earlier in the day, the U.S. Navy said it was searching for an active shooter at the Naval Sea Systems Command headquarters, where about 3,000 people work. The exact number of people killed and the conditions of those wounded was not immediately known. (AP Photo/Jacquelyn Martin)

  • Police Work The Scene

    Police work the scene on M Street, SE in Washington near the Washington Navy Yard on Monday, Sept. 16, 2013. The U.S. Navy says one person is injured after a shooting at a Navy building in Washington. Police and emergency crews gathered Monday morning outside the Naval Sea Systems Command Headquarters building, where the shooting was reported. (AP Photo/Jacquelyn Martin)

  • Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said.'There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel,' the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

  • Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said.'There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel,' the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

  • Scene At The Gate Of Navy Yard

  • Police respond to the report of a shooting at the Navy Yard in Washington, DC, September 16, 2013. A gunman shot and wounded at least one person Monday in a headquarters building at the US Navy Yard in Washington and is still at large, the navy said.'There is one confirmed injury. Emergency personnel are on scene and a 'shelter in place' order has been issued for Navy Yard personnel,' the navy said in a statement. Local television reported that there were as many as five casualties and the Navy said that police had entered building number 197 in search of the shooter. The Navy said at least three shots were fired at 8:20 am (1320 GMT) in the headquarters building of the Naval Sea Systems Command. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

  • Outside Navy Yard

  • Police Clear Block

  • Looking Up M Street

  • Members of the military guard a military garage near the Washington Navy Yard where a gunman was reported in Washington, on Monday, Sept. 16, 2013. The exact number of people killed and the conditions of those wounded was not immediately known. (AP Photo/Jacquelyn Martin)

  • A helicopter that has been airlifting people from the top of a building at the Washington Navy Yard circles the area after a gunman was reported at the Washington Navy Yard in Washington, on Monday, Sept. 16, 2013. The exact number of people killed and the conditions of those wounded was not immediately known. About 3,000 people work at the Naval Sea Systems Command headquarters. (AP Photo/Jacquelyn Martin)

  • Police bring in equipment by an anchor outside of an entrance to the Washington Navy Yard where a gunman was reported in Washington, on Monday, Sept. 16, 2013. The exact number of people killed and the conditions of those wounded was not immediately known. About 3,000 people work at the Naval Sea Systems Command headquarters. (AP Photo/Jacquelyn Martin)

  • Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

    WASHINGTON, DC - SEPTEMBER 16: Construction workers wait at the end of the 11th Street Bridge adjacent to the Navy Yard complex where a shooting took place early this morning September 16, 2013 in Washington, DC. Early reports indicate that several people may have been shot, and police are still trying to determine the number of suspects involved in the shooting. (Photo by Win McNamee/Getty Images)

  • Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

    WASHINGTON, DC - SEPTEMBER 16: Armed ATF agents stage on the 11th Street Bridge adjacent to the Navy Yard complex where a shooting took place early this morning September 16, 2013 in Washington, DC. Early reports indicate that several people may have been shot, and police are still trying to determine the number of suspects involved in the shooting. (Photo by Win McNamee/Getty Images)

  • Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

    WASHINGTON, DC - SEPTEMBER 16: People shelter in place outside a building at the Navy Yard complex where a shooting took place early this morning September 16, 2013 in Washington, DC. Early reports indicate that several people may have been shot, and police are still trying to determine the number of suspects involved in the shooting. (Photo by Win McNamee/Getty Images)

  • Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

    WASHINGTON, DC - SEPTEMBER 16: Police boats patrol the water outside a building at the Navy Yard complex where a shooting took place early this morning September 16, 2013 in Washington, DC. Early reports indicate that several people may have been shot, and police are still trying to determine the number of suspects involved in the shooting. (Photo by Win McNamee/Getty Images)

  • Shooting At Washington DC Navy Yard Reportedly Leaves Several Wounded

    WASHINGTON, DC - SEPTEMBER 16: A Park Police helicopter hovers above a building at the Navy Yard complex where a shooting took place early this morning September 16, 2013 in Washington, DC. Early reports indicate that several people may have been shot, and police are still trying to determine the number of suspects involved in the shooting. (Photo by Win McNamee/Getty Images)