A preliminary report depicted confusion in the cockpit shortly before an Air India jetliner crashed and killed 260 people last month, after the plane's engine fuel cutoff switchesflipped almost simultaneously and starved the engines of fuel, Reuters reported.

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 accidentin 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, according to Reuters.