Prosecutor: Boston Marathon bomber "wanted to punish America"

Jury to get case in Boston bombing trial

Update: The jury found Dzhokhar Tsarnaev guilty of all charges in the Boston Marathon bombing.

BOSTON -- As he planted a backpack containing a bomb just feet from a group of children, Dzhokhar Tsarnaev made a cold-hearted decision aimed at spreading terror and punishing America for its wars in Muslim countries, a federal prosecutor told jurors Monday during closing arguments in Tsarnaev's death penalty trial.

"There was nothing about this day that was a twist of fate," said Assistant U.S. Attorney Aloke Chakravarty. "This was a cold, calculated terrorist act. This was intentional. It was bloodthirsty. It was to make a point. It was to tell America that we will not be terrorized by you anymore. We will terrorize you."

Defense attorney Judy Clarke countered by arguing, as she did at the trial's outset, that Tsarnaev took part in the attack but that he did so under the malevolent influence of his now-dead older brother, Tamerlan. Clarke repeatedly referred to Dzhokhar Tsarnaev as a "kid" and a "teenager."

"We don't deny that Dzhokhar fully participated in the events, but if not for Tamerlan, it would not have happened," Clarke said.

5 things to know about the Dzhokhar Tsarnaev trial

The jury is expected to begin deliberating Tuesday morning in the case against Tsarnaev, 21, almost two years after the twin bombings near the finish line of the Boston Marathon killed three people and wounded more than 260. It was the nation's deadliest terror attack since 9/11.

If Tsarnaev is convicted - and that was considered a near certainty, given his lawyer's admission - the jury will begin hearing evidence on whether he should get life in prison or a death sentence.

Prosecutors used their closing argument to remind the jury of the horror of that day, showing photographs and video of the carnage and chaos after the twin pressure-cooker bombs exploded. In a video that showed the aftermath of the first blast, jurors could hear the agonizing screams of Krystle Campbell, a 29-year-old restaurant manager who bled to death on the sidewalk.

Taking aim at the argument that Dzhokhar Tsarnaev was led astray by his older brother, Chakravarty repeatedly referred to the Tsarnaevs as "a team" and "partners" in the attack.

Tamerlan Tsarnaev, 26, died four days after the bombings after he was shot by police and run over by Dzhokhar during a getaway attempt. Dzhokhar was captured hiding in a dry-docked boat.

"That day, they felt they were soldiers. They were the mujahedeen, and they were bringing their battle to Boston," Chakravarty said.

Boston Marathon prosecution rests case after emotional testimony

As for the youngsters killed or maimed in the attack, Chakravarty said: "These children weren't innocent to him. They were American. Of all the places that he could have placed the bomb, he placed it right there."

At the end of his closing argument, Chakravarty displayed photos of the three people killed in the bombings - including 8-year-old Martin Richard - and the MIT police officer who was shot to death during the getaway attempt.

"They are no longer with us," Chakravarty said. "This is the result of the defendant's choice to be a terrorist, his choice to make a statement. These were choices that he was proud of."

Clarke took a conciliatory tone with her closing argument, admitting the attack brought "tragedy, suffering and grief in dimensions that none of us could imagine were possible."

And she said Tsarnaev "stands ready by your verdict to be held responsible for his actions."

But Clarke also said Tamerlan played a much more prominent role in the attack, buying bomb components, including pressure cookers, BBs and remote control parts.

She also said Tamerlan researched via computer how to build the bombs and planned the attack. His fingerprints were found on bomb parts, while Dzhokhar's were not.

CBS News Legal Analyst Rikki Klieman told "CBS This Morning" on Monday that the defense is setting the stage for the penalty phase by portraying Dzhokhar Tsarnaev as being manipulated by his older brother, something Klieman called "an effective strategy."

Klieman said she doesn't expect the jury to return a verdict as quickly as other experts have predicted.

"They have this massive indictment. They have 30 counts," Klieman said. "And this is their first time that they get to talk about this case. And that they want to have this cathartic experience of talking about what happened here. Also, my view is, the longer the deliberations on guilt -- even though the guilt is a foregone conclusion, Judy Clarke has said it was him -- if the deliberations are long, it means that then they will be looking at the penalty phase even in the guilt phase."

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