Two men were arrested by the FBI on Tuesday morning in connection with an explosion that went off in Harvard Medical School over the weekend.

The pair, Logan David Patterson, 18, and Dominick Frank Cardoza, 20, face charges of conspiracy to damage by means of fire or an explosive, per the charging document.

Per police reports, at about 2:45 a.m. Saturday morning, an officer saw two persons fleeing the Goldenson Building following an explosion on the fourth floor, which houses the school’s Department of Neurobiology.

U.S. Attorney for Massachusetts Leah Foley said Tuesday that the explosive was a Roman candle firework, and while the explosion was deliberate, there is no confirmed motive. No other devices were found at the scene, and no one was injured.

FBI Special Agent Ted Docks said t

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