Burundi's national university has been unexpectedly closed amid protests in the capital.

Bujumbura has been hit by street protests since Sunday as the security forces confront demonstrators who say a third term for President Pierre Nkurunziza would violate the country's constitution. The university's dorms have been closed and students are returning home.

Nkurunziza was nominated by his party on Saturday and presidential elections are scheduled for June 26.

The government is accused of clamping down on communications, with platforms such as Twitter and Facebook having been blocked by authorities, according to the U.N. Office for the Coordination of Humanitarian Affairs.

On Thursday, protesters were still on the streets, some erecting barricades and burning tires.