Authorities are reporting that explosives have been reported to have been placed in four separate locations on the Harvard University campus.

12/16/2013 11:51am Harvard says that state and federal authorities are joining the probe to determine whether there are indeed explosives on campus.  Until they determine the next course of action activities - including exams - remain suspended.

Update: 12/16/2013 10:50am

According to Harvard's latest Twitter feed Dean Jasmine Waddell is sitting with students in Annenberg Hall while the buildings remain evacuated:

Buildings have been evacuated and law enforcement officials are conducting a sweep of the campus.

According to Harvard's Twitter page the Cambridge Police Department and Harvard University Police are investigating.  The Science Center, Thayer, Sever, and Emerson Buildings have been evacuated.