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.

The Harvard University Police Department confirmed that there was no structural damage to the Goldenson Building after what the school called an intentional explosion inside the building early Saturday morning.

An apparently “intentional” explosion at at a Harvard University medical building early Saturday is under investigation, authorities said.

The Harvard PD called in the Boston Fire Department’s arson unit, which determined that the explosion appeared to be intentional. The Boston Police Department swept the building but did not find