BOSTON -- Survivors of the Boston Marathon bombings got little satisfaction from surviving suspect Dzhokhar Tsarnaev's first public appearance since the deadly attacks. "Not guilty," was all he said, over and over.

The blase-looking 19-year-old, his arm in a cast and his face swollen, entered his pleas Wednesday during a seven-minute arraignment in federal court.

Bombing victims showed little reaction in the courtroom after a federal marshal warned them against any outbursts, but some made their views known afterward - as did a group of chanting Tsarnaev supporters.

"I thought that maybe he would come with a different attitude or maybe look a little different, maybe look like he cared a little bit. But he didn't show me that," said Peter Brown, whose two nephews each lost their right legs in the explosions.

Tsarnaev 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. Then he was led away in handcuffs, making a kissing gesture toward his sisters with his lips. One 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 twin explosions that left three people dead and more than 260 wounded. Tsarnaev also is charged in the killing of a Massachusetts Institute of Technology police officer and the carjacking of a motorist during a getaway attempt. 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 and their families but with police officers, 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.

MIT Police Chief John DiFava, who was 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 gunbattle with police several 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'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.