UPDATED: Harvard investigates unconfirmed reports of explosives on campus, two buildings cleared of threat

Harvard Alert: Unconfirmed reports of explosives at 4 sites on campus: Science Center, Thayer, Sever & Emerson. Evacuate those buildings now

— The Harvard Crimson (@thecrimson) December 16, 2013

Harvard Alert: HUPD and CPD are on the scene and investigating. Please stand by for more info.

— The Harvard Crimson (@thecrimson) December 16, 2013

We’ll update this post as Harvard releases more information.

This is the latest update from Harvard’s emergency information web site:

Alert: 12/16/2013

9:33am EST

The Harvard University Police Department (HUPD) this morning received an unconfirmed report that explosives may have been placed in four buildings on campus: the Science Center, Thayer, Sever and Emerson Halls. HUPD and Cambridge Police are on the scene. Out of an abundance of caution, the buildings have been evacuated while the report is investigated. Harvard’s focus is on the safety of our students, faculty and staff. We will update the media when we have more information.

Update: 10:19 a.m. ET-

Students have filled Annenberg Hall after being evacuated this morning due to bomb threats. More @thecrimson pic.twitter.com/sC1WiU3hnJ

— The Harvard Crimson (@thecrimson) December 16, 2013

Update: 12:10 p.m. ET –

Harvard Alert: Report of bombs on campus remains unconfirmed. Federal and state officials have joined the probe. More @thecrimson

— The Harvard Crimson (@thecrimson) December 16, 2013

A Department of Homeland Security sits vehicle behind Annenberg around noon Mon. @thecrimson pic.twitter.com/QhCh2SkEAf

— The Harvard Crimson (@thecrimson) December 16, 2013

Update: 12:55 p.m. ET –

Harvard Alert: As of 12:50 p.m., Thayer and Emerson halls are cleared and students may return. Sever and Science Center are still closed.

— The Harvard Crimson (@thecrimson) December 16, 2013