Authorities say the explosion at Harvard Medical School appears to have been intentional. no one got hurt

There was an explosion early Saturday morning Harvard Medical School Authorities said it appeared to be intentional, but no one was injured.

A University Police officer responding to a fire alarm tried to stop two unidentified people running from the Goldenson Building before they could get to where the alert was issued, University Police said in a statement.

boston Police said the fire department determined the explosion was intentional and officers did not find additional devices in their investigation of the building.