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President Obama said Tuesday that the FBI is investigating the deadly Boston Marathon bombings as an “act of terrorism.”

He stressed that several questions remain, including who carried out the act, or what motivated the bombings.

He said that it was not clear whether it was an act of home-grown terrorism, or whether it was the result of an international cell that inflicted the carnage at the finish line of the Boston Marathon about 2:50 p.m. Monday. Nor was it clear if it was the work of one person, or a group of people.

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