Tamerlan died four days later after a shootout with police, while Dzhokhar is in custody.
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Dzhokhar Tsarnaev was injured during the police manhunt and remains in hospital in a fair condition.
Dzhokhar, 19, was shot and injured during the police manhunt and remains in a prison hospital.
The hearing on Capitol Hill comes less than three weeks after Dzhokhar Tsarnaev's arrest.
Three of Dzhokhar Tsarnaev's friends have been accused of covering for the bombing suspects.
The FBI is examining Dzhokhar Tsarnaev's laptop, two federal law enforcement officials told CNN.
Dzhokhar Tsarnaev had left an hour earlier, a roommate told them, according to the affidavit.
Dzhokhar Tsarnaev attended the University of Massachusetts Dartmouth with the three friends charged Wednesday.
The only question Dzhokhar asked was how much Danny paid for his Mercedes SUV.
Authorities say Tamerlan Tsarnaev and his younger brother, Dzhokhar, also killed a police officer.
The black SUV with Dzhokhar behind the wheel managed to escape, with cops giving chase.
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Holder also responded to criticism that the surviving suspect, Dzhokhar Tsarnaev, was read his Miranda rights.
This other student was in a picture with Dzhokhar last year in New York's Time Square.
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His younger brother, Dzhokhar Tsarnaev, 19, was captured and charged in connection with the attack.
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Dzhokhar Tsarnaev was in New York in late 2012, likely in November, Kelly said.
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Tamerlan died after a shootout with police on Thursday night, and Dzhokhar was captured on Friday.
She said the older brother was a "macho guy, " whereas Dzhokhar seemed more cerebral.
Surveillance tape late Thursday showed Dzhokhar Tsarnaev, Suspect No. 2, at a gas station.
Tsarnaev's brother, Dzhokhar Tsarnaev, 19, is being held in a prison hospital after being shot before capture.
Tsarnaev's younger brother, Dzhokhar, is in a prison hospital facing charges that could bring the death penalty.
He knew Dzhokhar and his older brother Tamerlan as "regular kids" with a taste for expensive cars.
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Tamerlan Tsarnaev died April 19 after a firefight with police, and Dzhokhar Tsarnaev, who survived, has been charged.
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That led to a police shootout in which Tamerlan Tsarnaev suffered fatal injuries and Dzhokhar was badly wounded.
Authorities say Tsarnaev and his younger brother, Dzhokhar, carried out the April 15 bombings at the Boston Marathon.
He was reportedly run over by his 19-year-old brother Dzhokhar, who was making a desperate bid to escape.
Dzhokhar Tsarnaev, 19, was listed in fair condition as he recovered from wounds suffered during a getaway attempt.
Dzhokhar Tsarnaev, 19, is hospitalized with gunshot wounds, including one to the throat that has hampered his speech.
That official would not comment on any motive or specifics on what Dzhokhar Tsarnaev has communicated to officials.
The Obama administration said it had no choice but to prosecute Dzhokhar Tsarnaev in the federal court system.
Many of those who knew Dzhokhar Tsarnaev in Cambridge expressed disbelief at his alleged involvement in the bombings.
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