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BARCROFT MEDIA photoTamerlan Tsarnaev practiced boxing at the Wai Kru Mixed Martial Arts center in Boston in this April 2009 photo.
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BARCROFT MEDIA photoTamerlan Tsarnaev arrived at the Wai Kru Mixed Martial Arts center in Boston in this April 2009 photo.
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Anne RearickTamerlan Tsarnaev, with Somerville boxing club trainers, got his hands laced at a Golden Glove event in Lowell on May 15, 2006.
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Anne RearickTamerlan Tsarnaev, with Micky Ward, a former professional boxer, at a Golden Gloves event in Lowell on May 15, 2006.
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FBIDzhokhar A. Tsarnaev was being sought by police in the Boston Marathon bombings.
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Bob LeonardLaw enforcement officials identified two suspects in the Boston Marathon bombings as brothers Dzhokhar A. Tsarnaev (left) and Tamerlan Tsarnaev. Tamerlan was killed in a confrontation with police.
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Bob Leonard photoThe suspects were photographed near the finish line.
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David Green/APWhat appears to be Dzhokhar A. Tsarnaev (left, in white hat) is shown walking away after the Marathon bombings on Monday.
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Boston Regional Intelligence CenterDzhokhar A. Tsarnaev in a photo release early Friday morning.
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The Boston Marathon bombings killed three people and injured more than 170, some of whom lost limbs.
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Dzhokhar A. Tsarnaev, in a yearbook photo, was a member of the class of 2011 at the Cambridge Rindge & Latin School.
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VKontakte/AFP/Getty ImagesAn undated image of what appears to be Dzhokhar Tsarnaev taken from VKontakte, a Russian social media site.
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Dzhokhar A. Tsarnaev was on the wrestling team in high school, former classmates said.
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Boston Regional Intelligence CenterDzhokhar A. Tsarnaev in an undated photo.
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FBIThe FBI initially referred to Dzhokhar A. Tsarnaev, here in security camera footage shortly before the Marathon bombing, as Suspect 2.
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“We believe this to be a terrorist,’’ Boston Police Commissioner Edward Davis told reporters. “We believe this to be a man here to kill people.”
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The brothers killed an MIT police officer and later seriously injured a Transit Police officer, officials said.
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FBITamerlan Tsarnaev, initially known as Suspect 1, died early Friday morning after a shootout with police, officials said.
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FBIThe brothers led law enforcement in a car chase and threw grenades at officers, injuring about 20 officers, officials said.
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FBITamerlan Tsarnaev’s injuries were inflicted by a combination of blasts and gunshots, said Dr. Richard Wolfe of Beth Israel Deaconess Medical Center.
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FBIWhen his brother was injured and apprehended, Dzhokhar A. Tsarnaev escaped.