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 warning affected a narrow, but densely populated area that included downtown Chicago. Flash flooding was seen from the downtown area through the West Side along the Eisenhower Expressway to Oak Park, as the slow-moving storm hovered stubbornly over the area.

AAIB officials have also informed a parliamentary committee that it is retrieving parts of the plane’s wreckage to be sent to the original equipment manufacturers (OEM) so they can be checked for poss