The United Nations says an armed group fired at a U.N. police patrol monitoring a protest near the airport in the capital of the Central African Republic, wounding six constables.

A U.N. peacekeeping official said the wounded policemen were evacuated by the U.N. mission after the incident at 8 p.m. local time on Friday.

Earlier Friday, about 300 unarmed youths occupied the runway at the airport in Bangui to demand the resignation of transitional President Catherine Samba-Panza, the official said, speaking on condition of anonymity because he was not authorized to speak publicly.

Central African Republic has been devastated by months of unprecedented violence between Christians and Muslims that has sent thousands of Muslims fleeing the country. At least 5,000 people have died.