Militants in southwestern Pakistan have attacked another convoy carrying fuel to NATO forces in neighboring Afghanistan, and set the oil tankers alight. The attackers sprayed the oil trucks with bullets, causing them to catch fire on a main highway in the Dasht area, some 20 kilometers (12 miles) south of Quetta, the capital of restive Baluchistan province. "Unknown gunmen opened fire on five oil tankers parked at the roadside on the main Quetta-Jacobabad national highway in the Dasht area late Friday after which the vehicles caught fire," said police official, Abdul Salam, adding that there were no casualties. The tankers were waiting for a paramilitary and police escort for their onward journey to Afghanistan via the Chaman border. No group has claimed responsibility for the attack, but in the past Taliban-linked militants carried out similar attacks to disrupt supplies to US-led troops in Afghanistan. Taliban-linked militants frequently launch attacks on NATO supply vehicles in the northwest and southwest Pakistan area bordering landlocked Afghanistan.