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(CNN) — The FBI is taking the lead in investigating the double bombing that caused death and destruction near the finish line of the Boston Marathon on Monday, authorities said.

A range of different agencies are involved in the hunt to find out who carried out the lethal attack and why, but officials are cautioning that very little is known at this point.

“This will be a combined federal, state and local effort,” Richard DesLauriers, the special agent in charge of the FBI’s Boston Division, said at a news briefing by law enforcement officials on Monday evening.

Describing it as a “criminal investigation” that is also “a potential terrorist investigation,” DesLauriers said the FBI was declaring federal jurisdiction over the matter through the Boston Joint Terrorism Task Force.

It wasn’t clear Monday whether the origin of the bombings was domestic or foreign, according to a federal law…

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