MULTAN,April 24th: At least four policemen including a sub inspector have died in an encounter between the police and the terrorists who set twelve oil tankers transporting fuel for NATO on fire in Mianwali district. These oil-tankers were parked at a petrol pump in Tala-gang town some 250 miles north-west of Multan on Saturday night.Regional Police Officer (RPO) Muhammad Aslam Khan Tareen said," some unidentified miscreants set a dozen oil takers on fire which transporting petrol for the NATO forces," He said unknown miscreants opened indiscriminate firing on tankers parked at a petrol pump at Mianwali Road in Tala Gang that triggered fire in the tankers and the pump.Police patrol reached the scene then miscreants also opened fires at police party. They killed a sub inspector and three constables. However, the miscreants escaped when police retaliated with fire.The RPO said the area has been cordoned off.