CAMBRIDGE, Mass. — Four buildings on Harvard University’s campus near Boston were evacuated this morning after the school’s police department received an unconfirmed report that explosives may have been placed inside.

Final exams have begun at the Ivy League school in Cambridge, and many of the students who had to leave went to Annenberg Hall, another campus building, according to the school’s paper, The Harvard Crimson. Three of the evacuated buildings border Harvard Yard and the other is the school’s science center.

Both school and city police were investigating and the university will provide more information soon, it said in alerts on its emergency page and its Twitter account.

“Out of an abundance of caution, the buildings have been evacuated while the report is investigated,” the school said in a statement. “Harvard’s focus is on the safety of our students, faculty and staff.”