• Police are investigating unconfirmed reports of explosives at Harvard
  • Students have been urged to evacuate the Science Center, Sever Hall, Emerson Hall and Thayer Hall, which are all on the main campus
  • Final exams have begun and some have now been canceled
Students at Harvard University are evacuating four campus buildings after police received unconfirmed reports of explosives on Monday morning.

Authorities urged students at the Ivy League college in Cambridge, Masachusetts to leave the Science Center and three other buildings - Sever Hall, which contains classrooms for the humanities, Emerson Hall, the philosophy building, and a freshman dorm, Thayer Hall.

Harvard issued the emergency alert for students shortly after 9am on Monday. Its Twitter account noted that there have not been any reports of explosions.

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Evacuations: Students gather in the Science Center Plaza at Harvard University on Monday after police received unconfirmed reports that explosives had been planted at four campus buildings

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Escape: Students are pictured gathering in Annenburg Hall as they awaited updates on Monday
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
The Harvard University Police Department and the Cambridge Police Department are on the scene and investigating but students have been advised to stand by for more information.

'The campus community will be notified through a variety of mechanisms including the Web, email and voicemail,' the website said.

'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.'

Final exams have begun at the school and the school confirmed that some exams today have now been canceled.

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Sites: Explosives may have been placed at four properties indicated on this map: the Science Center, Thayer Hall, Sever Hall and Emerson Hall - one is a freshman dorm and two more are classrooms
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Reports: Students are being urged to evacuate four buildings at Harvard University (pictured) following unconfirmed reports of explosives on Monday morning
The campus newspaper, The Harvard Crimson, shared a photograph of students swarming the Science Center Plaza after the threats were reported.

The paper also said that students have filled the study hall at Annenberg Hall after being evacuated.

Three of the buildings being evacuated in Cambridge border Harvard Yard.

This is a breaking news story. Please check back for updates.