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. No one was injured. The building houses labs and offices associated with the school's neurobiology department.

Medical school officials said the explosion caused no structural damage and that all labs and equipment remained intact. The Boston Fire Department determined that the explosion was intentional. Police said officers did not find additional devices during a sweep of the building.

An officer who responded to a fi

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