The Boeing 787 Dreamliner bound for London from the Indian city of Ahmedabad began to lose thrust and sink shortly after takeoff, according to the report on the world's deadliest aviation accident in a decade released on Saturday by Indian accident investigators.

The report by India's Aircraft Accident Investigation Bureau(AAIB) about the June 12 crash raises fresh questions over the position of the critical engine fuel cutoff switches.

Almost immediately after the plane lifted off the ground, closed-circuit TV footage showed a backup energy source called a ram air turbine had deployed, indicating a loss of power from the engines.

--Reuters--