Investigators in India are studying the black boxes of a Boeing 787 Dreamliner after recovering them from the aircraft wreckage to ascertain the cause of last week’s plane crash that left at least 270 people dead.

LR, landed in Kolkata from San Francisco. During the layover, a technical issue was identified in the left engine. According to reports, the pilot instructed all passengers to deplane at around 5.20 am.