Explosion at Harvard Medical School Building Deemed “Intentional” – Investigation Underway
An explosion rocked the fourth floor of the Goldenson Building at the Harvard Medical School’s Longwood Campus in Boston in the early hours of Saturday, Nov. 1, 2025. Authorities have determined the blast appears to have been intentional, though fortunately no injuries were reported.
The incident
Shortly after 2:45 a.m., a fire alarm was triggered in the Goldenson Building. A responding officer from the Harvard University Police Department (HUPD) arrived and observed two unidentified individuals fleeing the building. After entering the building, the officer discovered signs of an explosion on the fourth floor.
The Boston Fire Department’s arson unit conducted a sweep and found no additional explosive devices, and concluded the explosion appeared deliberately set.
Investigation and response
The HUPD is coordinating with Boston police, state agencies and the FBI’s Boston field office to investigate the incident. Surveillance images of the two individuals have been released; one wearing a balaclava and hoodie, the other in a dark hooded sweatshirt and plaid pants. Authorities are urging anyone with information to come forward.
While the extent of property damage has not been fully detailed, Harvard has temporarily restricted access to parts of the building and adjacent areas for safety assessments.
Significance & context
The event underscores campus-safety vulnerabilities even at major institutions like Harvard.
The intentional nature of the blast places the incident beyond an accident or equipment failure, elevating it to a criminal investigation.
Though no casualties occurred, the timing—early morning when fewer people were present—likely prevented greater harm.
The involvement of federal agencies such as the FBI reflects the potential broader implications of the case.
What to watch for
Identification and apprehension of the two individuals seen fleeing the scene.
Determination of motive, device type, and whether the attack was targeted at research, personnel or infrastructure.
Any announcements from Harvard University regarding structural damage, lab disruptions or security upgrades.
Broader institutional responses to campus safety and threat mitigation nationally
