Investigators have arrested two people after an explosion at a Harvard Medical School building over the weekend.

The FBI confirmed Tuesday that FBI Boston's Joint Terrorism Task Force and Harvard University Police Department arrested two Massachusetts men in the case. More details are expected to be released Tuesday afternoon.

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An officer who responded to a fire alarm early Saturday morning encountered two people running from the Goldenson Building on Longwood Avenue, according to university police. The explosion occurred on the fourth floor of the building, which houses labs and offices associated with the medical school's Department of Neurobiology.

The Boston Fire Department determined that the explosion was i

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