The Harvard University Police Department is investigating what it is calling an intentional explosion inside a building on the medical campus early Saturday morning.

Police say the explosion occurred around 2:48 a.m. on the fourth floor of the Goldenson Building at 220 Longwood Ave.

There were no reports of any injuries.

A responding officer saw two people fleeing the scene and tried stopping them, but was unsuccessful, according to police.

Investigators from the Boston Fire Department Arson Unit made an initial assessment that the explosion appeared to be intentional.

Boston police officers conducted a sweep of the building to check for additional devices.

The Harvard University Police Department is actively investigating the incident, as well as the FBI and other law enforcement ag

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