This photo provided by the Harvard University Police Department shows...

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. Credit: AP/Uncredited

BOSTON — 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.

Newsday's Gregg Sarra talks to Carey football player James McGrath about how he has persevered after losing his parents at a young age, and to the Lahainaluna (Hawaii) High School football coach about how his team persevered after the Maui wildfires of 2023, plus a behind-the-scenes look at the All-Long Island teams photo shoot. Credit: Newsday/John Paraskevas

Sarra Sounds Off, Ep.16: From Island to island, how football helped overcome tragedy Newsday's Gregg Sarra talks to Carey football player James McGrath about how he has persevered after losing his parents at a young age, and to the Lahainaluna (Hawaii) High School football coach about how his team persevered after the Maui wildfires of 2023, plus a behind-the-scenes look at the All-Long Island teams photo shoot.

Newsday's Gregg Sarra talks to Carey football player James McGrath about how he has persevered after losing his parents at a young age, and to the Lahainaluna (Hawaii) High School football coach about how his team persevered after the Maui wildfires of 2023, plus a behind-the-scenes look at the All-Long Island teams photo shoot. Credit: Newsday/John Paraskevas

Sarra Sounds Off, Ep.16: From Island to island, how football helped overcome tragedy Newsday's Gregg Sarra talks to Carey football player James McGrath about how he has persevered after losing his parents at a young age, and to the Lahainaluna (Hawaii) High School football coach about how his team persevered after the Maui wildfires of 2023, plus a behind-the-scenes look at the All-Long Island teams photo shoot.

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