Three of the buildings being evacuated in Cambridge border Harvard Yard.
The school posted alerts on its emergency page and its Twitter account. They say that both school and city police are investigating, and the university will provide more information soon.
Harvard says in a statement that its university police department received the unconfirmed report that explosives may have been placed in the four buildings and they were evacuated out of an abundance of caution.
Final exams have begun at the Ivy League school.