The Pakistani Taliban has claimed responsibility for an attack on NATO supply vehicles in south-western Pakistani city of Quetta on Wednesday. A spokesman for the militant group told CNN that a special squad designated to strike NATO supply efforts made the attack. Quetta police said 20 oil tankers parked near Quetta were set ablaze, and one person died in the attack. At least five other attacks have been carried out on vehicles carrying supplies for NATO forces in the past week, killing at least six people. The Pakistani Taliban has claimed responsibility for two of earlier attacks. The spokesman said these attacks were carried out as revenge for drone strikes and NATO's attacks in Pakistan.