As the world waits for answers on the fatal Air India crash, accident investigators have narrowed their focus on the engine fuel control switches.

Preliminary findings suggest the switches controlling fuel flow to the plane’s two engines were turned off, resulting in a sudden and complete loss of thrust, according to a Wall Street Journal exclus

Indian aviation accident authorities are set to release a preliminary report this week into the Air India Ltd. plane that crashed almost a month ago, a person familiar with the plan said.