Explosion at Harvard Medical School appears to have been intentional, authorities say. No one hurt

This photo provided by the Harvard University Police Department shows a person of interest in an explosion at the Harvard Medical School in Boston, on Saturday, Nov. 1, 2025. (Harvard University Police Department via AP)

BOSTON (AP) — 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.