CAMBRIDGE, USA (AP):
Final exams at the Harvard University's campus near Boston were cancelled today after the school's police department received an unconfirmed report that explosives may have been placed in the building.
Four buildings on the school's campus were evacuated.
Earlier a tweet on the university's twitter account advised students to evacuate the four buildings immediately.
Alert: Unconfirmed reports of explosives at four sites on campus: Science Center, Thayer, Sever, and Emerson. Evacuate those buildings now.— Harvard University (@Harvard) December 16, 2013