The failure of police to catch the killers of a teenage girl whose mutiliated body was found in November has prompted the worst unrest in Botswana in nearly three decades.
Stone-throwing crowds prevented motorists Friday from entering the central business district. Riot police fired tear gas and rubber bullets to disperse student demonstrators.
President Ketumile Masire convened an emergency Cabinet meeting.
Students accuse police of inefficiency in finding the killer of 14-year-old Segametsi Mogomotsi, who is believed to have been killed in a witchcraft ritual.