Kohat- A police officer today shot dead his parents and son over domestic dispute in Mianghan colony in Kohat. According to police sources, the accused named Bilal who is a police constable in Saddar police station opened fire at his parents and eight years old son over domestic dispute, killing them on the spot. The accused managed to flee from the scene after committing the crime. Police shifted the deceased to hospital for postmortem and registered a case against the accused. Police started search for arresting the accused.