A pilotless U.S. aircraft crashed in northwest Pakistan's South Waziristan region on Tuesday, Pakistani news channels reported, but American officials denied the United States had lost any drones. U.S. forces have launched a string of attacks with missiles fired by drones, and one ground assault, on militant targets in northwest Pakistan in recent weeks, infuriating Islamabad, which says the attacks violate Pakistani sovereignty. Pakistani news reports said the drone came down near the border village of Angor Adda, where U.S. commandos launched a ground assault on September 3 that Pakistani officials said killed 20 people, including women and children. U.S. officials said no unmanned aircraft were lost or crashed. "No such thing occurred," one senior U.S. official said. A Pakistani intelligence officer in the region said he had no information but had heard claims by a Taliban faction that a drone had been shot down on the Afghan side of the border. A Pakistani military spokesman declined to comment and reporters were unable to reach the remote area at night.