Intentional Explosion at Harvard Medical School

A device exploded early Saturday morning inside the Goldenson Building on Harvard Medical School’s Longwood campus at about 2:48–3:00 a.m., detonating on the building’s fourth floor and causing no reported injuries. Harvard University Police, who responded to a triggered fire alarm, reported seeing two masked individuals fleeing the scene before officers entered and have released grainy surveillance images seeking public help to identify them. The Boston Fire Department’s arson unit preliminarily determined the blast was intentional, and a subsequent sweep of the building found no additional devices. The investigation is being led by Harvard University Police in coordination with Boston, state and federal law enforcement, with the FBI assisting at the scene. Officials have asked anyone with information to contact Harvard University Police.