ATTOCK - Four policemen were killed and six others got injured when they rushed towards Nato tankers attacked by militants near a police picket, some 80 kilometres away from Attock, on Sunday night. According to police sources, the armed miscreants attacked Nato oil tankers near Dhulian Checkpost about 10:00 pm. On hearing the firing, a police party rushed towards the site. As police party reached there, the militants attacked the cops, leaving four of them dead. The militants later moved towards police picket and injured six policemen there, the sources added. Fourteen Nato oil tankers caught fire due to the indiscriminate firing of the militants, the sources said. The militants managed to flee after the incident. Meanwhile, the bodies were shifted to a nearby hospital while the injured were shifted to Rawalpindi for treatment, the sources said. The deceased were identified as Sub-Inspector M Ramzan, Head Constable Munir and Constables Asif and Zafar. Later heavy contingent of police and rescue teams moved towards the site and cordoned off the area. The police personnel launched a search operation in the area. However no arrest was made till filing of this report.