US aircraft catches fire in Qatar
Crew escapes safely after B-1 bomber crashes at al-Udeid military base.
A US defence official, who spoke to the AFP news agency on condition of anonymity said that the bomber had hit something while taxiing.
Earlier reports had suggested that the aircraft had crashed while landing at the base.
The B-1 Lancer is a supersonic, long-range bomber which carries a crew of four people.
Last month, a B-1 bomber slid off the runway at Anderson Air Force base on Guam, crashing into a group of emergency vehicles.
The military reported that there were no injuries and no fatalities as a result of that accident.