Police say 7 militants on motorcycles attacked the parked oil tankers Thursday night . The tankers had been parked since Pakistan shut down NATO air routes last month . Closing the routes was a response to NATO airstrike that killed two Pakistani soldiers . During the past two years militants have increasingly targeted NATO tankers and supply trucks in an attempt to disrupt two key supply routes and undermine the NATO mission in neighboring Afghanistan . No casualties reported in the attacks on tankers ; police say the attackers escaped .
Police say 7 militants on motorcycles attacked the parked oil tankers Thursday night . The tankers had been parked since Pakistan shut down NATO air routes last month . Closing the routes was a response to NATO airstrike that killed two Pakistani soldiers . No casualties reported in the attacks on tankers ; police say the attackers escaped .