(Headline USA) There was an explosion early Saturday at Harvard Medical School that appears to have been intentional, but no one was injured, authorities said.
A university police officer who responded to a fire alarm tried to stop two unidentified people who ran from the Goldenson Building before going to where the alert was triggered, university police said in a statement.
The Boston Fire Department determined that the explosion was intentional and officers did not find additional devices in a sweep of the building, police said.
Police released grainy photos of two people wearing face coverings and what looked like sweatshirts.
Adapted from reporting by the Associated Press
