As the world waits for answers on the fatal Air India Boeing 787 crash, accident investigators have narrowed their focus on the engine fuel control switches.

The London-bound flight crashed shortly after takeoff, descending rapidly from 650 feet and killing 241 of the 242 people on board, along with casualties on the ground.

Investigators have hinted that pilot error will likely be deemed the cause of the disaster, with a focus on the engine fuel control switches.