A US drone strike in North waziristan area killed at least four militants on Tuesday, officials said. The unmanned aircraft fired two missiles, hitting a compound and a vehicle parked outside it in Miramshah, the main town of North Waziristan tribal district, a senior security official told a foreign news agency. At least four militants were killed, the official said, adding that two others were also wounded. Another security official and an intelligence official confirmed the attack and casualties. The identity of the militants was not immediately clear, officials said.