QUETTA - Around two dozen tankers and containers loaded with supplies for NATO forces deployed in Afghanistan were completely destroyed in Pak-Afghan border town of Chaman in a bomb blast on Sunday evening. According to official sources in Chaman, unidentified people had planted an explosive device with NATO oil supplies near Customs House in Chaman. The explosive went off with a big bang. and dozens of tankers and trucks caught fire. Resultantly, at least two dozen oil tankers and containers carrying supplies for the American and NATO forces in Afghanistan were destroyed. Soon after the blast, Frontier Corps (FC) cordoned off the area where the fire continued to blaze till Sunday evening. The fire cannot be immediately extinguished owing to its huge magnitude and lack of fire-fighting arrangements, the district government officials informed The Nation and added that Chaman district government has only two fire brigades which were insufficient to extinguish such a huge fire. Drivers of some containers claimed the NATO supplies were attacked with rocket from nearby area which resulted in destruction of their trucks. However, the nature of blast is yet to be ascertained. Authorities said the Pak-Afghan border had already been shut for the past two days due to a dispute between Afghan and Pakistan customs officers that caused a major rush of stranded vehicles on the both sides of Chaman border. The Chaman border is one of two main crossing points for supplies for American and NATO troops fighting the Taliban in Afghanistan. Officials said they had also seized and defused a bomb on Sunday morning from another truck carrying supplies. No group has accepted responsibility for firing the rocket so far. A lot of residents of the area came out of their homes to see the huge fire caused by the rocket attack. Cases of attacks on NATO supplies, which pass from Balochistan, had taken place in the past as well but Sunday attack is believed to be the biggest ever. Local sources informed that the NATO supplies included oil, armoured vehicles, edible items and small tanks. Around 1500 vehicles were carrying NATO supplies when the blast occurred. Meanwhile, eleven people including three personnel of Frontier Corps were injured in grenade attacks in Khuzdar and Sui on Sunday night. According to official sources, unidentified persons attacked a FC vehicle at hospital road Khuzdar with a hand grenade. The hand grenade exploded and caused injuries to three personnel of Frontier Corps. The injured were shifted to nearby hospital. The assailants escaped from the site after committing crime. Moreover, unidentified persons lobbed a hand grenade at the house of one Khadim Hussain in Sui town of Dera Bugti. Hand grenade went off with a huge explosion and injured eight persons including three women and two children. The injured were shifted to hospital for treatment.