Indian investigators' preliminary report on the crash of an Air India flight that killed 260 people has put the focus squarely on the pilots and the aircraft's fuel switches.

In the cockpit voice recording, one of the pilots is heard asking the other why he "did the cut-off", the other pilot replied that he didn't.

Investigators looking into the Air India crash that killed 260 people are trying to uncovering a ‘mistake’ made by the pilots. Early assessments by US officials suggest the crash was not caused by problems with the Boeing 787 Dreamliner. The findings suggest that switches controlling fuel flow to the jet’s two engines were turned off.