A UK-bound plane which burst into flames at Las Vegas Airport suffered multiple breaches of the engine case, investigators have found.
Parts of the high pressure compressor were also found on the runway, according to the National Transportation Safety Board.
An initial examination of the British Airways jet revealed the left engine, fuselage and wing of the plane were substantially damaged in the fire.
The aircraft's flight data recorders are now being examined by experts.
The plane's 157 passengers, 10 crew and three pilots all escaped safely.
The report said there were several minor injuries as a result of the evacuation, mostly abrasions.
It added: "Initial examination of the left engine revealed multiple breaches of the engine case in the area around the high pressure compressor.
"Examination of the material recovered from runway found several pieces of the high pressure compressor spool (approximately 7-8 inches in length).
"Initial examination of the airplane by NTSB revealed that the left engine and pylon, left fuselage structure and inboard left wing airplane were substantially damaged by the fire. This damage will be documented over the next several days."
