2 men arrested in explosion at Harvard University and accused of setting off firework in medical building, FBI says

Two Massachusetts men arrested in connection with an explosion Saturday at Harvard University are accused of detonating a firework inside a laboratory locker in a medical building, federal authorities said Tuesday.

Logan David Patterson, 18, of Bourne, and Dominick Frank Cardoza, 20, of Plymouth, were charged with conspiracy to damage by means of fire or an explosive. If convicted, they could face up to five years in prison, three years of supervised release and fines of up to $250,000.

Cardoza’s lawyer didn’t immediately respond to NBC News’ request for comment. It’s not clear whether Patterson has an attorney.

Around 2:33 a.m. Saturday, Patterson and Cardoza were seen on security video wearing face coverings, walking near the school’s medical building and lighting what appeared to be a Roman candle firework, Leah Foley, the U.S. attorney for the District of Massachusetts, said at a news conference.

Read more: NBC News