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The FBI and state and local police are intensifying their probe into Monday’s bombing at the finish line of the Boston Marathon, vowing a “worldwide investigation” and appealing to the public for tips and cell phone pictures that might yield clues about who was behind the horrific attack.

“At this time there are no claims of responsibility,” FBI officials said in a press conference Tuesday. “The range of suspects and motives remains wide open.”

Three died and at least 176 were injured when two bombs went off just before 3 p.m., shattering a festive atmosphere several hours after the legendary race began on the city’s 238th annual Patriots’ Day.

Officials found that the bombs consisted of explosives put in ordinary 1.6-gallon pressure cookers, one with shards of metal and ball bearings, the other with nails, a person close to the investigation tells the Associated Press. The bombs were stuffed into black duffel bags and left on the ground, the person said.

Read more at Fox News

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The FBI and state and local police are intensifying their probe into Monday's bombing at…