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.

India's aviation safety watchdog has asked Air India for the training records of the pilots and dispatcher for the plane that crashed last week as part of its investigation into the incident that killed at least 271 people,

There have been cases of a very small number of survivors in very serious accidents, but it is "very rare" for there to be only one, a professor told Newsweek.