Unknown motorcyclists shot dead three persons including son and father sitting in their Dera in Nawan Kot area on Monday. According to Police, old enmity between Malik Ashraf and Anwari Chaudhry on the acquisition of tender in Bakra Mandi was running for so long. As Malik Ashraf and his son were sitting in their Dera infront of their house when unidentified men opened indiscriminate fire on them. Resultantly, Malik Ashraf, his son Azhar died at the spot whereas one of the residents Sufi Muhammad Hussain succumbed to injuries in the hospital. Removing the dead bodies to the hospital, local police started investigations.