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By Scott Malone BOSTON (Reuters) - The bombs that tore through the crowd at the Boston Marathon in a deadly 2013 attack were powered by flash powder used in fireworks, an FBI chemist said on Thursday as prosecutors move toward the end of their case. Federal Bureau of Investigation chemistry specialist David McCollam testified in the 14th day of Dzhokhar Tsarnaev's trial on charges of killing three people and injuring 264 people with a pair of homemade pressure-cooker bombs at the race's finish line on April 15, 2013. The bombs used in the attack, as well as others thrown at police during a gunfight in the suburb of Watertown, Massachusetts, after Tsarnaev and his older brother, Tamerlan, allegedly killed a university police officer, had the distinctive signs of low-powered explosives, said McCollam. The jury on Thursday saw a photo of an intact "Big Snow" firework found in Dzhokhar Tsarnaev's dorm room at the University of Massachusetts at Dartmouth and another, with the powder removed, found in a backpack taken from the room by a friend of Tsarnaev.
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