FBI arrests 2 men in connection with Harvard Medical School explosion

The FBI’s Boston Field Office has announced that two men in Massachusetts have been arrested in connection with an explosion at Harvard Medical School on Saturday. 

The arrests were made by the FBI's Boston Joint Terrorism Task Force, with assistance from the Harvard University Police Department (HUPD). 

The FBI is investigating an explosion at Harvard Medical School. (Getty Images)

Officials said more details will be released at a news conference Tuesday afternoon.

The explosion happened just after 2:45 a.m. Saturday in the Goldenson Building. Two masked suspects were seen fleeing from the building after the blast went off in a small section of the fourth-floor hallway, Harvard officials said on Sunday.

The section where the explosion happened has since been cleared and is fully operational, the university said. Officials added that the building did not sustain any structural damage and all labs and equipment remained intact.

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Harvard University Police Department released surveillance photos of the two masked suspects fleeing the building at the time of the explosion on Saturday, Nov. 1, 2025. (Harvard University Police Department )

No one was injured in the explosion, officials said.

HUPD on Saturday released surveillance photos of two suspects wearing masks and head coverings fleeing the building at the time of the blast.

The Boston Fire Department Arson Unit responded and made an initial assessment that the explosion appeared to be intentional, officials previously said, and they believe a single device to be involved.

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Two people were seen running from the building after the explosion, according to Harvard University officials. (Getty Images)

The university said HUPD is maintaining an increased presence on the Longwood campus as the investigation remains active and ongoing.

Fox News Digital’s Alexandra Koch contributed to this report.