QUETTAUnknown gunmen shot dead three persons in Mastung district, some 60 kilometers southeast of provincial capital on Friday. According to police sources, unidentified motorcyclists armed with sophisticated weapons sprayed volley of bullets on a group of people at Dasht area of Mastung. As a result, they sustained critical wounds and died on the spot. The assailants escaped from the site after committing the crime. Police took the bodies to Civil Hospital Mastung for autopsy and handed them over to heirs after completing legal formalities. Motive behind the killing is stated to be old enmity. Police has registered a case against unknown persons and started further investigations.