An apparently "intentional" explosion at a Harvard University medical building early today is under investigation, authorities said.

An officer responded to the Goldenson building about 2:48 am local time and saw two people fleeing the building after a fire alarm was activated, according to the Harvard University Police Department.

On the building's fourth floor it was apparent there had been an explosion – one that an arson team has initially assessed "appeared to be intentional," police said.

Boston police swept the building for "any additional devices" but none were found, and no injuries were reported, officials said.

"The Harvard University Police Department is actively investigating this incident in coordination with local, state, and federal law enforcement partners," univ

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