U.S. drone crashes in Angoor Adda

ANGOOR ADDA: A pilotless U.S drone aircraft crashed in the northwestern Pakistani region of South Waziristan on Tuesday but it was not clear why it came down, Pakistani news channels reported.

U.S. forces have launched a string of attacks with missiles fired by drones, and one ground assault, on militant targets in northwestern Pakistan in recent weeks infuriating the U.S. ally which says the attacks are a violation of Pakistani sovereignty.