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The Wall Street Journal: Shrapnel-filled New York bombs used ‘Christmas lights’ as detonators

NEW YORK—Counterterrorism agents were combing through surveillance videos as they hunted for a bomb maker who set off an explosion in New York Saturday night that injured 29 people, putting the city on high alert.

Officials said they were trying to determine if the explosion in Manhattan, an unexploded device that was found four blocks away and a blast earlier in the day about 80 miles away in New Jersey were the work of the same individual or group.

Investigators in New York determined that both bombs were made using pressure cookers that were filled with explosives and shrapnel, including ball bearings or metal BBs, and could be detonated using flip phones and Christmas lights, a law enforcement official said.

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