A federal judge continued questioning prospective jurors Thursday in the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev. Those questioned included people who said they cannot be impartial because they already believe Tsarnaev is guilty, people who said they could not impose the death penalty under any circumstances and a woman who said she thought it would be "cool" to be on a jury.

Tsarnaev, 21, is charged in the 2013 deadly attack. Three people were killed and more than 260 were injured when two bombs exploded near the finish line.

Judge George O'Toole Jr. has questioned about 140 prospective jurors so far. He has not said how many of them have been excused. Here's a look at what some of the prospective jurors had to say Thursday:

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Juror #303: Senior account executive at a public relations firm, opposed to the death penalty.

"I don't think for me I would be able to do something like that, make that decision."

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Juror #306: Financial analyst, recent college graduate.

"I formed my own opinion that he is guilty, just by watching everything that happened when it was happening."

"I think he's guilty, no matter what."

"As far as being guilty, I'm confident in my belief that he is."

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Juror #308: Associate director of a youth program, Northeastern University, former community service officer and dispatcher for Northeastern's public safety department, was working as a dispatcher the day Tsarnaev was captured hiding in a boat in Watertown.

"I just thought it would be nice to be a part of history."

"I thought it would be cool to be a part of history."

"There's no doubt that the Boston Marathon caused a lot of fear in the city. If the prosecution can prove that he was the cause of it and the cause of three people dying, then yes, the death penalty would seem appropriate."

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Juror #321: Singer and musician at Irish bars around New England, strongly opposed to the death penalty, says he could never impose the death penalty, cites mistakes that have been made in other death penalty cases.

"Never means never."

"I don't agree with the death penalty."

"Too many things have gone wrong over the years."