BOSTON — Defense attorneys for convicted Boston Marathon bomber Dzhokhar Tsarnaev on Wednesday tried to downplay prosecution claims that their client had shown anger and defiance at the U.S. when he raised his middle finger at a surveillance camera, and said he may instead have been upset or depressed over a conflict with a guard.

That image of Tsarnaev has become a crucial piece of evidence in the trial’s penalty phase, in which the jury must decide whether to sentence him to death or life in prison with no possibility of parole.

In this July 10, 2013, surveillance photo released by the U.S. Attorney's office, Dzhokhar Tsarnaev extends his middle finger in an obscene gesture to a security camera in his jail cell in Devens, Mass. The photo was presented during the penalty phase of Tsarnaev's trial on Tuesday as a federal prosecutor laid out the government's case for executing him.

Wednesday was the second day jurors saw the image, which dates from July 10, 2013. On Tuesday, prosecutors showed them a photo, which turned out to be a still from a video.

Defense lawyers won permission to show two minutes of the video, which clearly shows an anxious then-19-year-old Tsarnaev pacing around his jail cell, sitting and standing, fussing with his hair, scratching his neck and clearly agitated.

At one point, he approaches the front of the cell and talks to someone, presumably a guard. One of Tsarnaev’s attorneys, Miriam Conrad, suggested to jurors that he may have wanted to lodge a complaint about the way he was being treated.

But Deputy U.S. Marshal Gary Oliveira, who testified to authenticate the photo and video, said he did not know what Tsarnaev was unhappy about. That left Conrad and the defense team with the option of exploring the incident further when they open their case in the penalty phase next week.

“Had anything occurred right before this that he was reacting to?” Conrad asked Oliveira. “Did anything occur which he seemed to be reacting to?”

“Not that I know,” Oliveira said. “I don’t recall.”

The video was made before Tsarnaev’s arraignment on charges of killing three people and wounding more than 260 others with two pressure-cooker bombs at the marathon finish line, and killing a Massachusetts Institute of Technology police officer days later as he and his elder brother, Tamerlan, tried to flee. Tamerlan was killed during the ensuing manhunt and Dzhokhar was wounded.

Tsarnaev, now 21, was convicted this month for his role in the attack. The defense contends that Tamerlan was the leader and Dzhokhar his acolyte.

It was the worst terrorist attack on U.S. soil since Sept. 11, 2001.

Also Wednesday, the government introduced more testimony from victims and their families.

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