Two persons have been killed and four injured in a remote- controlled bomb blast in Dera Ismail Khan. According to police sources, the bomb was planted in a car of advocate Mastan Ali Shah parked in DIK district court. Two persons killed and four injured in the blast. The bodies and injured shifted to district headquarter hospital where one is reported in a critical condition. Several vehicles also damaged in the blast. Police have cordoned off the area and started investigations.