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, although further details were not provided. The explosion occurred early Saturday on the fourth floor of the Goldenson Building, which has labs and offices associated with the school's neurobiology department. Fortunately, there were no injuries reported. Medical school officials stated that the explosion did not cause any structural damage, and all equipment within the labs remained intact. The Boston Fire Department classified the explosion as intentional. Officers did not find any additional devices during a thorough sweep of the building. Moreover, university police reported that an officer responding to a fire alarm encountered two individuals fleeing from the site.}