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.

Air India on Tuesday afternoon cancelled its Ahmedabad-London Gatwick flight citing "operational issues". No further explanation has been offered by the airline, passengers said. Sources at Ahmedabad's Sardar Vallabhai Patel Airport said passengers will be re-routed.