Harvard University says evacuates four buildings after bomb threat

Harvard University said on its website on Monday that it had received an "unconfirmed" bomb threat and was evacuating four buildings on its campus outside Boston.

Three classroom buildings - The Science Center, Sever and Emerson Halls - and one dormitory, Thayer Hall, were affected, the Ivy League school said on its website.

The threat comes three days after a coordinated attack by gunmen and suicide bombers killed 127 people in Paris.