Harvard Medical School Explosion Causes No Structural Damage

A device exploded early Saturday in a fourth-floor hallway of the Goldenson Building on Harvard Medical School’s Longwood campus at about 2:48–3:00 a.m.; the Boston Fire Department’s arson unit has characterized the blast as intentional. There were no reported injuries, no structural damage, and officials said labs and equipment in the affected area remained intact; a subsequent sweep found no additional devices. A Harvard University police officer responding to the fire alarm saw two masked individuals flee, and the university released grainy surveillance photos as the FBI and local law enforcement assist the investigation. Campus police increased patrols, the small affected section of the fourth-floor hallway has been cleared, and officials said the building reopened for classes Monday. Investigators have released no motive or device details and are urging anyone with information to contact Harvard University Police.