Investigators are still searching for two suspects following an explosion at Harvard Medical School early Saturday that appeared to be intentional.

Harvard Medical School students were shocked to wake up to an email this weekend notifying them of an explosion inside one of their campus buildings on Longwood Avenue.

Stream NBC10 Boston news for free, 24/7, wherever you are. WATCH HERE

It happened around 3 a.m. Saturday at the Goldenson Building, which is being renovated. A Harvard police officer responding to a fire alarm saw two people running from the building. He tried to stop them — but the suspects got away.

Inside, the officer found signs of a blast on the fourth floor, and investigators believe it was intentional.

No one was hurt, and no other devices were found. Police s

See Full Page