A fire engine outside a building on the campus
Media playback is unsupported on your device
Video

Harvard University evacuated amid explosives alert

Harvard University in the US state of Massachusetts has evacuated its campus amid "unconfirmed reports" of explosives at four of its buildings.

The university's Twitter feed said there were no reports of an explosion and no indication that any bombs had been placed on campus.

Harvard campus police and local police were said to be on the scene.