The university sent out an alert on its official Twitter account, warning that the Science Center, Thayer, Sever and Emerson buildings on the school's Cambridge, Mass. campus may have been targeted.
Alerts stressed the reports of explosives were unconfirmed and that there had been no reports of explosions. Harvard and Cambridge police were on scene investigating.
Update: 11:00 a.m. EST
Harvard officials have given the all clear, with early reports suggesting the report of explosives could have been a hoax.
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
Alert: HUPD and CPD are on the scene and investigating. Stand by for more info. View emergency page for updates http://t.co/VAZ1odRYB9— Harvard University (@Harvard) December 16, 2013
Alert: Reports of bombs placed on campus are unconfirmed. There have been NO reports of explosions. View for updates: http://t.co/gAWVUFoPtp— Harvard University (@Harvard) December 16, 2013
Update: HUPD/Cambridge Police on scene. Unconfirmed report that explosives may have been placed in 4 campus buildings http://t.co/dr5PFJr2Is— Harvard University (@Harvard) December 16, 2013