Law enforcement is investigating an explosion at Harvard University medical school building that appeared to be "intentional," according to multiple reports .

A police officer responded at 2:48 a.m. on Saturday after a fire alarm was activated in the Goldenson building.

The officer reported seeing two people fleeing the scene before locating a fire on the building's fourth floor where there appeared to be an "intentional" explosion. The officer tried to approach and the pair before entering the building.

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No injuries were reported and the Boston police swept the building for "any additional devices" but found none.

The FBI als

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