QUETTA - Unidentified persons set a girl’s middle school on fire, in district of Chagai here on Monday.Local levies sources said that the incident occurred in the area of Afghan refugees camp in Killi Rehmatullah in night between Sunday and Monday.“Some unknown persons using kerosene set the boundary wall of school on fire, resultantly some rooms and its boundary wall were damaged,” they added. They said that Levies have registered a case against unidentified persons.