(KUNA) -- The law-enforcement agencies conducted a raid Saturday morning in the southwestern city of Quetta, arresting seven militants, including three foreigners, hours after a university professor was killed in sectarian violence, said police. The combined teams of law-enforcement agencies and police conducted raid in the city of Quetta, the capital of Baluchistan province, police sources told KUNA. The two sides, said sources, exchanged fire that left one militant killed and at least two policemen wounded. Sources said the raid ended in the arrest of seven militants, including three foreigners. They added that forces also recovered a big cache of arms and ammunition from their possession including suicide jackets, remote-controlled bombs and other explosive material. The raid came hours after unknown gunmen shot to death a university professor in the city on Saryab Road area. Following the killing, the local authorities declared three days of mourning.