At least five people have been killed by a blast in Kohat Police Line Colony at Hangu Road, report said. The blast was of high intensity and more casualties were feared. Nearby houses have been badly affected by the blast. Entire area has been cordoned off by the law enforcement personnel. Rescue teams and ambulances have reached the spot. Nature of the blast was not known but Commissioner Kohat Khalid Khan told media that it might be a planted bomb device.