BOSTON (AP) — Two Massachusetts men have been arrested in connection with a weekend explosion at Harvard Medical School, authorities said Tuesday. The FBI’s Boston office announced the arrests on social media ahead of a 1 p.m. news conference. It didn’t provide further details. The explosion occurred early Saturday on the fourth floor of Harvard Medical School’s Goldenson Building, which houses labs and offices associated with the school’s neurobiology department. Fortunately, no one was injured, and medical school officials stated that the explosion caused no structural damage, ensuring that all labs and equipment remained intact. The Boston Fire Department determined that the explosion was intentional, and police reported that officers did not find any additional devices during a thorough sweep of the building. Notably, an officer who responded to a fire alarm that morning observed two individuals fleeing from the building.