Two men were arrested in connection with a Saturday explosion at Harvard Medical School , according to reports.

Both men were detained by the FBI’s Boston Joint Terrorism Task Force, Fox News reported .

Nobody was injured when the blast went off around 2:45 a.m. in a fourth floor hall at the school’s Goldenson Building, with two people in masks caught on surveillance footage fleeing the scene.

The site has since been cleaned and reopened.

The blast is believed to have been intentional, and started by a single device, according to investigators.

Harvard University Police also assisted with the arrests.

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