12/16/2013 10:10 EST | Updated 02/15/2014 05:59 EST

Harvard warns of 'unconfirmed' explosives at 4 buildings

Harvard University is warning of "unconfirmed reports" of explosives planted at four buildings on its Cambridge, Mass., campus. 

The school said Monday it evacuated the buildings. There have been no explosions. 

The four buildings cited by the university on its Twitter account were the Science Center, and Thayer, Sever and Emerson halls.

"Out of an abundance of caution, the buildings have been evacuated while the report is investigated," the university said at its website. "Harvard's focus is on the safety of our students, faculty and staff.  We will update the media when we have more information."

Final exams are underway at the university.