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Left: JOHANNES HIRN/LANDOV; Right: HandoutMarathon bombing suspects Tamerlan Tsarnaev (left), pictured in 2009, and Dzhokhar Tsarnaev, in a yearbook photo.
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Left: JOHANNES HIRN/LANDOV; Right: The Lowell Sun/Julia Malakie/APTamerlan Tsarnaev practiced boxing at the Wai Kru Mixed Martial Arts center in Boston in 2009 (left), and received a boxing trophy in 2010.
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Left: BOSTON REGIONAL INTELLIGENCE CENTER; Right: Robin Young vis APDzhokhar A. Tsarnaev, pictured at a Cambridge gas station early Friday morning (left) and after graduating from Cambridge Rindge and Latin High School.
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ANNE REARICKTamerlan Tsarnaev got his hands laced at a Golden Glove event in Lowell on 2006 (left) and posing with former professional boxer Micky Ward.
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Glenn DePriest/Getty Images)Tamerlan Tsamaev (left) during a boxing in Utah in 2009.
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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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Bob LeonardDzhokhar A. Tsarnaev (left) and Tamerlan Tsarnaev were pictured on Boyston Streen shortly before the Boston Marathon bombings.
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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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CBS NEWS/AFP/Getty ImagesThis image shows Tsarnaev, who was captured after being found hiding in a boat in a Watertown backyard.
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ReutersMedical workers treated Dzhokhar A. Tsarnaev moments after he was captured.