BOSTON -- His arm in a cast and his face swollen, a blase-looking Dzhokhar Tsarnaev pleaded not guilty Wednesday in the Boston Marathon bombing in a seven-minute proceeding that marked his first appearance in public since his capture in mid-April.

As survivors of the bombing looked on, Tsarnaev, 19, gave a small, lopsided smile to his two sisters upon arriving in the courtroom. He appeared to have a jaw injury and there was swelling around his left eye and cheek.

Leaning into the microphone, he told a federal judge, "Not guilty" in his Russian accent and said it over and over as the charges were read. Then he was led away in handcuffs, making a kissing gesture toward his family with his lips. One of his sisters sobbed loudly, resting her head on a woman seated next to her.

Tsarnaev, who has been hospitalized since his capture with wounds suffered in a shootout and getaway attempt, faces 30 federal charges, including using a weapon of mass destruction to kill, in connection with the April 15 attack that left three people dead and more than 260 wounded. He could get the death penalty if prosecutors choose to pursue it.

The proceedings took place in a heavily guarded courtroom packed not only with victims but with their families, police officers, and members of the public and the media.

The Russian immigrant and former college student looked much as he did in a photo widely circulated after his arrest, his hair curly and unkempt. Wearing an orange prison jumpsuit, he appeared nonchalant, almost bored, during the hearing. The cast covered his left forearm, hand and fingers.

The bombing victims showed little reaction in the courtroom after a federal marshal warned them against any outbursts.

Liz Norden, the mother of two men who lost their right legs in the bombings, said afterward: "I actually felt sick to my stomach."

MIT Police Chief John DiFava, who was also in the courtroom, said Tsarnaev looked "smug."

"I didn't see a lot of remorse. I didn't see a lot of regret," he said. "It just seemed to me that if I was in that position, I would have been a lot more nervous, certainly scared."

DiFava added: "I just wanted to see him. I wanted to see the person that so coldly and callously killed four people, one of whom being an officer of mine."

Authorities say Tsarnaev orchestrated the bombing along with his older brother, Tamerlan Tsarnaev, who died following a gun battle with police three days after the attack. Dzhokhar Tsarnaev was arrested on April 19, hiding in a bloodstained boat in a suburban backyard after a manhunt that paralyzed much of the Boston area.

Tsarnaev is also charged in the killing of a Massachusetts Institute of Technology police officer and the carjacking of a motorist during their getaway attempt.

His two sisters were in court in Muslim garb. One was carrying a baby; the other wiped away tears with a tissue. Tsarnaev's parents remained back in Russia.

Tsarnaev's lawyer Judy Clarke, an expert in death penalty cases, asked that the judge enter not-guilty pleas for him, but U.S. Magistrate Judge Marianne Bowler said: "I would ask him to answer."

On the same day as the arraignment, Boston's police commissioner appeared on Capitol Hill and complained to a Senate panel that the Justice Department failed to share information on terrorism threats with local officials before the bombing.

"There is a gap with information sharing at a higher level while there are still opportunities to intervene in the planning of these terrorist events," Commissioner Edward F. Davis III said.

Reporters and spectators began lining up for seats in the courtroom at 7:30 a.m. as a dozen Federal Protective Service officers and bomb-sniffing dogs surrounded the courthouse. Four hours before the 3:30 p.m. hearing, the defendant arrived at the courthouse in a four-vehicle motorcade.

About a dozen Tsarnaev supporters cheered as the motorcade arrived. The demonstrators yelled, "Justice for Jahar!" as Tsarnaev is known. One woman held a sign that said, "Free Jahar."

Lacey Buckley said she traveled from her home in Wenatchee, Wash., to attend the arraignment. She said she believes he is innocent. "I just think so many of his rights were violated. They almost murdered an unarmed kid in a boat," she said.

A group of friends who were on the high school wrestling team with Tsarnaev at Cambridge Rindge and Latin waited in line for hours, hoping to get a seat.

One of them, Hank Alvarez, said Tsarnaev was calm, peaceful and apolitical in high school.

"Just knowing him, it's hard for me to face the fact that he did it," said Alvarez, 19, of Cambridge.

Prosecutors say Tsarnaev, a Muslim, wrote about his motivations for the bombing on the inside walls and beams of the boat. He scrawled that the U.S. government was "killing our innocent civilians," and also wrote: "We Muslims are one body, you hurt one you hurt us all."

Martin Richard, 8, Krystle Marie Campbell, 29, and Lingzi Lu, 23, were killed by the two bombs, which were fashioned out of pressure cookers, gunpowder, nails and other shrapnel. Numerous victims lost legs.

___

Associated Press writer Arsen Mollayev in Makhachkala, Russia, contributed to this report.

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  • Azamat Tazhayakov, Dias Kadyrbayev, Dzhokhar Tsarnaev

    This undated photo added on April 18, 2013 to the VK page of Dias Kadyrbayev shows, from left, Azamat Tazhayakov and Dias Kadyrbayev, from Kazakhstan, with Boston Marathon bombing suspect Dzhokhar Tsarnaev in Times Square in New York. Kadyrbayev and Tazhayakov, two college buddies of Tsarnaev, were jailed by immigration authorities the day after Tsarnaev's capture. They are not suspects, but are being held for violating their student visas by not regularly attending classes, Kadyrbayev’s lawyer, Robert Stahl said. They are being detained at a county jail in Boston. (AP Photo/VK)

  • Dias Kadyrbayev, Dzhokhar Tsarnaev

    This undated photo found on the VK page of Dias Kadyrbayev shows Kadyrbayev, left, with Boston Marathon bombing suspect Dzhokhar Tsarnaev, at an unknown location. Kadyrbayev and Azamat Tazhayakov, two college buddies of Tsarnaev from Kazakhstan, were jailed by immigration authorities the day after his Tsarnaev's capture. They are not suspects, but are being held for violating their student visas by not regularly attending classes, Kadyrbayev’s lawyer, Robert Stahl said. They are being detained at a county jail in Boston. (AP Photo/VK)

  • FILE - This combination of undated file photos shows Tamerlan Tsarnaev, 26, left, and Dzhokhar Tsarnaev, 19. The CIA added the name of dead Boston Marathon bombing suspect Tamerlan Tsarnaev, to a U.S. government terrorist database 18 months before the deadly explosions, U.S. officials told The Associated Press on Wednesday, April 24, 2013. The CIA's request came about six months after the FBI investigated Tamerlan Tsarnaev, also at the Russian government's request, but the FBI found no ties to terrorism, officials said. (AP Photo/The Lowell Sun & Robin Young, File)

  • Dzhokhar Tsarnaev

    FILE - This wanted poster released by the FBI on Friday, April 19, 2013 shows Dzhokhar Tsarnaev, the suspect the FBI orginally called suspect number 2 in the bombings at the Boston Marathon. (AP Photo/FBI)

  • Katherine Tsarnaeva, Judith Russell

    Katherine Tsarnaeva , widow of Boston Marathon bomber suspect Tamerlan Tsarnaev, leaves the law office of DeLuca and Weizenbaum, with her mother Judith Russell, Tuesday, April 23, 2013, Providence, R.I. The attorneys, Amato DeLuca and Miriam Weizenbaum, issued a statement saying Tsnarnaeva is deeply mourning the bombing victims. They say that Tsarnaeva and her family were in shock when they learned of allegations against her husband and brother-in-law, Dzhokhar Tsarnaev. (AP Photo/Stew Milne)

  • Zubeidat Tsarnaeva

    Zubeidat Tsarnaeva, mother of Tamerlan and Dzhokhar Tsarnaev, the two men accused of setting off bombs near the Boston Marathon finish line on April 15, 2013 in Boston, walks near her home in Makhachkala, Dagestan, southern Russia, Tuesday, April 23, 2013. The Tsarnaev brothers are accused of setting off the two bombs at the Boston Marathon on April 15 that killed three people and wounded more than 260. Tamerlan Tsarnaev, 26, was killed in a gun battle with police. His 19-year-old brother, Dzhokhar Tsarnaev, was later captured alive, but badly wounded. (AP Photo/Ilkham Katsuyev)

  • This Monday, April 15, 2013 photo provided by Bob Leonard shows bombing suspects Tamerlan Tsarnaev, 26, center right in black hat, and his brother, Dzhokhar A. Tsarnaev, 19, center left in white hat, approximately 10-20 minutes before the blasts that struck the Boston Marathon. It's a vexing puzzle about the Boston Marathon bombings: The younger of the two accused brothers hardly seemed headed for a monumental act of violence. How could he team up with his older brother to do this? Nobody knows for sure, but some experts in sibling research say the powerful bonds that can develop between brothers may have played a role. (AP Photo/Bob Leonard)

  • This image taken from surveillance video provided by the Boston Regional Intelligence Center shows Boston Marathon bombing suspect Dzhokhar Tsarnaev at a Bank of America ATM in Watertown, Mass. at 11:18 p.m. on April 18, 2013. The next day, police intercepted Dzhokhar and his 26-year-old brother Tamerlan in a blazing gunbattle that the elder brother dead. Dzhokhar, 19, is charged with carrying out the Boston Marathon bombing April 15 that killed three people and wounded more than 260, and he could get the death penalty. (AP Photo/Boston Regional Intelligence Center)

  • This image taken from surveillance video provided by the Boston Regional Intelligence Center shows Boston Marathon bombing suspect Dzhokhar Tsarnaev at a Bank of America ATM in Watertown, Mass. at 11:18 p.m. on April 18, 2013. The next day, police intercepted Dzhokhar and his 26-year-old brother Tamerlan in a blazing gunbattle that the elder brother dead. Dzhokhar, 19, is charged with carrying out the Boston Marathon bombing April 15 that killed three people and wounded more than 260, and he could get the death penalty. (AP Photo/Boston Regional Intelligence Center)

  • Boston Marathon Explosions

    This photo released Friday, April 19, 2013 by the Federal Bureau of Investigation shows a suspect that officials identified as Dzhokhar Tsarnaev, being sought by police in the Boston Marathon bombings Monday. (AP Photo/Federal Bureau of Investigation)

  • This combination of photos provided on Friday, April 19, 2013 by the Federal Bureau of Investigation, left, and the Boston Regional Intelligence Center, right, shows a suspect that officials have identified as Dzhokhar Tsarnaev, being sought by police in connection with Monday's Boston Marathon bombings. (AP Photo/FBI, BRIC)

  • CNN confirms this was a former Twitter profile picture of the suspected Boston Marathon bomber.

  • Dzhokhar's profile photo on the social networking site vk.com was uploaded on March 19 2012. h/t <a href="http://www.buzzfeed.com/chrisgeidner/what-we-know-about-boston-marathon-bomb-suspect-dzhokhar-tsa" target="_blank">Buzzfeed</a>

  • Boston Police Department <a href="https://twitter.com/Boston_Police/status/325224387731152897" target="_blank">tweeted out this photo</a> of Dzhokhar Tsarnaev on Friday morning.

  • Robin Young (<a href="https://twitter.com/hereandnowrobin" target="_blank">@hereandnowrobin</a>) tweeted a photo of her nephew and Dzhokhar at graduation. She wrote: "My beloved nephew on right, djohar tsarnaev on left, happy cambridge Rindge and Latin grads.heartbreaking."

  • This photo, found on the social networking site vk.com shows Dzhokhar with an unidentified friend. The photo was uploaded 8 April, 2012.

  • Dzhokhar Tsarnaev (shown here, in black, with his face toward the camera) faced Milford High School's Andy Gleeson during a wrestling match in December 2010 in Framingham, Mass.