Authorities believe an explosion that rocked a Harvard Medical School building on Saturday was intentional, and the hunt for the suspects is on.

There were no injuries as a result of the blast inside the Goldenson Building, the Associated Press (AP) reported Saturday.

The explosion happened on the fourth floor of the building that is on the school’s main quad, the Harvard Crimson reported , citing the Harvard University Police Department (HUPD).

“The Boston Fire Department Arson Unit responded to the incident and determined the explosion to be intentional,” the article said.

“An officer who responded shortly before 3 a.m. observed two individuals fleeing the building, according to the email sent by HUPD spokesperson Steven G. Catalano this afternoon,” it continued.

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