A U.S. drone has crashed in Pakistan's North Waziristan region near the border with Afghanistan.

The unmanned aircraft crashed in the mountains late Saturday. Reports say militants are at the crash site, but it is not clear whether they shot down the plane.

The United States uses drone strikes to target Taliban and al-Qaida militants inside Pakistan. The drone program is unpopular with the Pakistani people, who say it is a violation of sovereignty and a threat to civilians.