FUEL control switches for the engines of an Air India flight that crashed last month were moved from the “run” to the “cut off” position moments before impact, starving both engines of fuel, a preliminary investigation report said on Saturday.

The report, issued by India’s Aircraft Accident Investigation Bureau, also indicated that both pilots were confused over the change to the switch setting, which caused a loss of engine thrust shortly after take-off.

The Air India flight, a Boeing 787-8 Dreamliner, crashed on June 12 and killed at least 260 people, including 19 on the ground, in the north-western city of Ahmedabad. Only one passenger survived the crash, which is one of India’s worst aviation disasters.

The plane was carrying 230 passengers along with 12 crew members.

According to the report, the flight lasted about 30 seconds between take-off and crash. It said that once the aircraft achieved its top recorded speed, “the engine one and engine two fuel cut-off switches transitioned from the ‘run’ to ‘cut off’ position one after another” within a second.

The movement of the fuel control switches allows and cuts fuel flow to the plane’s engines.

India’s Civil Aviation Minister Kinjarapu Ram Mohan Naidu said the report’s findings were preliminary and one should not “jump into any conclusions on this. Let us wait for the final report.”