OAK CREEK, Wis. -- A white supremacist who killed a half-dozen people at a Sikh temple in suburban Milwaukee last month chased down the first police officer on the scene, pumping round after round into him as he lay wounded behind a parked car, video released Monday showed.

Oak Creek Police Chief John Edwards played the video from Lt. Brian Murphy's squad car before telling reporters that Murphy was shot 15 times, not nine as authorities previously said. His armored vest stopped three of the rounds, Edwards said.

Murphy was shot while tending to two victims of Wade Michael Page's Aug. 5 rampage at the Sikh Temple of Wisconsin. Page, a 40-year-old Army veteran, opened fire with a 9 mm pistol shortly before Sunday services were to begin. He killed six worshippers and wounded four others, including Murphy, before killing himself.

Page's motive in the shooting spree remains unclear. The FBI is investigating, but U.S. Attorney James Santelle said it could be weeks or months before the agency releases any conclusions.

The squad car video shows a second officer arriving seconds after Page chased down Murphy. Officer Sam Lenda and Page exchange fire, and then Page, barely discernible in the distance, takes a round in the stomach and topples over. A final shot rings out as Page shoots himself in the head.

"Our police officers handled themselves in a professional and heroic manner," Oak Creek Mayor Steve Scaffidi said at the news conference where the footage was released. "Their actions probably saved lives."

Police released about one minute of footage from Murphy's squad car and about three minutes from Lenda's in response to an open records request from The Associated Press and others.

Murphy's dashboard-mounted camera shows him speeding to the temple and pulling into the sun-splashed parking lot. He stops in front of two victims, whose bodies were obscured before the video was released. Murphy can be seen on the edge of the screen with his .45-caliber pistol drawn, speaking into his radio.

Edwards told reporters Murphy reported he couldn't see the shooter, had discovered victims and needed an ambulance.

The video then shows Page, dressed in a white shirt and black pants, bursting out of the temple. Murphy spots him and raises his gun. Page runs out of the frame and Murphy rolls for cover behind a parked car, disappearing from view. Page then jogs back into the frame and walks quickly toward Murphy, shooting out the back windshield of a nearby car before moving off-screen again.

Milwaukee County District Attorney John Chisholm said Murphy was hit in the cheek as he rolled for cover and the bullet entered his throat. He tried to raise his gun again, but Page shot him in the thumb, knocking the weapon away. Then Page closed in on Murphy, firing from about 10 feet away, Chisholm said. Murphy told investigators he remembered wondering when Page would run out of ammunition.

"There's a deliberateness about him," Chisholm said of Page. "He intended to kill him."

Murphy did not attend the news conference. He was released from a hospital Aug. 22 and is recovering at home. Edwards said previously that Murphy can speak only in a whisper after being hit in the throat.

The video from Lenda's squad car shows him arriving about 10 seconds after Murphy was shot, bouncing over a median and into the temple's driveway. Page sees Lenda's vehicle and starts walking toward him.

Lenda, a police firearms instructor, throws the car into reverse and then moves forward again before stopping about 60 yards from Page. Lenda said he got out of the squad and hid behind the door with his AR-15 rifle.

Lenda can be heard in the video yelling several times at Page to drop his gun. Page fires and a portion of Lenda's windshield over the steering wheel explodes. Lenda fires six times at Page, who starts walking to his left and then abruptly falls over. A final shot can be heard at the end of the video as Lenda shouts at other officers, asking if they can see Page and if he's crawling.

"He had to be stopped and that's why I decided to shoot," Lenda said Monday. "I'm just an officer who did my job."

Earlier on HuffPost:

GALLERY: Sikh Temple Shooting
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  • In this undated combo photo composed of two images provided by the family, Indian Ranjit Singh, right, and Sita Singh who were killed in the shooting attack at a Sikh temple in Wisconsin are seen. The Indian born brothers were both killed in the shooting attack Sunday. (AP Photo)

  • Indian relatives of brothers Sita and Ranjit Singh who were killed in the shooting attack at a Sikh temple in Wisconsin, look at family photos at the family home in New Delhi, India, Tuesday, Aug. 7, 2012.

  • Ranjeet Singh

    In this undated family photo released Tuesday, Aug. 7, 2012, Indian Ranjeet Singh, who was killed in the shooting attack at a Sikh temple in Wisconsin, is shown. Singh, one of the victims of a shooting attack at a Sikh temple in the United States, never came home to India even once in 16 years, working at a grocery store during the week and volunteering at the Sikh gurdwara on weekends. He promised his family in India he was doing what had to be done to get a green card so they could come join him in the United States. (AP Photo/Ranjeet Singh family)

  • Indian Lokinder Kaur, third from right, mourns with her daughters Jasbir Kaur, 24, fourth from right, and Jaspreet Kaur, 21, second right, as they gather with other relatives at the family home in New Delhi, India, Tuesday, Aug. 7, 2012. Lokinder Kaur's husband Ranjeet Singh, one of the victims of a shooting attack at a Sikh temple in the United Staes, never came home to India even once in 16 years, working at a grocery store during the week and volunteering at the Sikh gurdwara on weekends. He promised his family in India he was doing what had to be done to get a green card so they could come join him in the United States. (AP Photo/Kevin Frayer)

  • Sita Singh

    In this undated family photo released Tuesday, Aug. 7, 2012, Indian Sita Singh, who was killed in the shooting attack at a Sikh temple in Wisconsin, is seen. Singh was killed during the attack on Sunday alongside his brother Ranjeet Singh who he had recently joined in the United States. (AP Photo/Seeta Singh family)

  • Sita and Ranjeet Singh

    Indian friends and relatives of Sita Singh who was killed in the shooting attack at a Sikh temple in Wisconsin, visit the family home in New Delhi, India, Tuesday, Aug. 7, 2012. Singh was killed alongside his brother Ranjeet Singh who he had recently joined in the United States during the attack on Sunday. (AP Photo/Kevin Frayer)

  • Indian Surinder Kaur, center, the wife of Sita Singh who was killed in the shooting attack at a Sikh temple in Wisconsin, is comforted by her son Armeet and daughter Sarabjit, second right, at the family home in New Delhi, India, Tuesday, Aug. 7, 2012. Sita Singh was killed alongside his brother Ranjeet Singh who he had recently joined him in the United States during the attack on Sunday. (AP Photo/Kevin Frayer)

  • Suveg Singh

    This undated photo provided by Mandeep Singh shows Suveg Singh Khattra. Balginder Khattra of Oak Creek, Wis. said Monday, Aug. 6, 2012, that his 84-year-old father, Suveg Singh Khattra, was among the dead in Sunday's shooting at a Sikh temple in Oak Creek, Wis. (AP Photo/Courtesy Mandeep Singh)

  • Indian Surinder Kaur, center, the wife of Sia Singh who was killed in the shooting attack at a Sikh temple in Wisconsin, is comforted by her son Armeet and daughter Sarabjit, right, at the family home in New Delhi, India, Tuesday, Aug. 7, 2012. Seeta Singh was killed alongside his brother Ranjeet Singh who he had recently joined in the United States during the attack on Sunday. (AP Photo/Kevin Frayer)

  • Harinder Kaur Rakhra, left, sister of Satwant Singh Kaleka who was killed in the shooting attack at a Sikh temple in the U.S. state of Wisconsin, is consoled by Seema Sharma, a local politician in Patiala, India, Monday, Aug. 6, 2012