Two Massachusetts men were arrested for an explosion that was “believed to have been a large, commercial firework” lit inside a Harvard University building early Saturday morning.

The two suspects, Logan D. Patterson, 18, and Dominick F. Cardoza, 20, each face a charge of conspiracy to damage by fire or explosive, which carries a maximum five-year federal prison sentence, according to the Massachusetts U.S. Attorney’s office.

The pair made their first appearance in federal court on Tuesday. Local news station WCVB reports that the men were ordered to stay away from Harvard’s campus and banned from handling firearms and fireworks.

Patterson and Cardoza were reportedly in Boston attending “Halloween social activities” at nearby Wentworth Institute of Technology, according to an FBI aff

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