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Harvard University flags above a campus store in Cambridge, Massachusetts, US, on Wednesday, April 16, 2025. Photographer: Sophie Park/Bloomberg via Getty Images

The FBI is investigating after an "intentional" explosion inside a building on Harvard University's Longwood medical school campus early Saturday.

Harvard officials told Fox News Digital that just after 2:45 a.m., a Harvard University Police Department (HUPD) officer was dispatched to the Goldenson building at 220 Longwood Avenue in Boston for a fire alarm activation.

When the officer arrived, they saw two people fleeing the building , officials said.

The officer tried to stop the pair before proceeding to the fourth floor where the alarm was triggered, finding an explosion had occurred.

The Boston Fire D

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