Both engines on the Air India flight shut down within one second of each other before the Boeing 787 Dreamliner crashed last month in Ahmedabad, India, killing at least 260 people, according to a preliminary report released Friday.

A preliminary report by Indian aviation accident investigators said on Saturday the fatal Air India crash that killed 260 people in Ahmedabad last month showed the plane engines fuel cutoff switches shifting from cutoff to run within seconds of each other.

Investigators probing the Air India crash that killed at least 260 people believe the actions of the jet’s pilots may have led to the crash, according to reports.Preliminary findings of the investigation into the Ahmedabad crash last month indicate that switches controlling fuel flow to the jet’s two engines were turned off,