Armed fighters released at least 900 prisoners in Beni, eastern Democratic Republic of Congo, in the early hours of Tuesday, according to the local mayor.
Among the inmates who have escaped from Kangbayi central prison are convicted militia members.
Some 110 inmates remained at the prison.
The attackers were equipped with welding equipment.
Mayor Modeste Bakwanamaha has blamed an armed group operating in the area for the attack.
He has asked residents to denounce escapees who may be hiding in the city.
Source: BBC