QUETTA - Unidentified gunmen on Thursday shot dead the Principal of a govt school despite tight security in Quetta. According to official sources, Muhammad Mohsin Ansary, the Principal of Government High School Sariab Mill, was shot dead by unknown assailants when he was on his way to school. He received critical wounds and succumbed to his injuries on the spot. The sources said that it could be an incident of target killing. The police shifted the body to Civil Hospital for postmortem and after completing legal formalities handed it over to the heirs. Soon after the incident police and personnel of Frontier Corps reached the crime scene and started collecting evidence. No group so far has claimed responsibility for the killing of school Principal. Police has registered a case against unknown assailants and started investigations. It may be mentioned that academicians in Balochistan have been the victims of target killings and several Principals including pro-Vice Chancellor of Balochistan University have fallen victim of target killing. Meanwhile, Watan Teachers Association (WTA) staged a protest demo outside Quetta Press club against the target killing of academicians and demanded for immediate arrest of culprits involved in these crimes. They also chanted slogans against govt and demanding security for teachers. They condemned the target killing of Principal of Government High School and alleged that govt had failed to provide security to the people. They warned that culprits involved in this heinous crime were not brought to justice within three days WTA would start massive protest across province and boycott classes.