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.

Investigations are intensifying into the crash of Air India Flight 171, which went down just seconds after take-off from Ahmedabad, killing 270 people and leaving many questions unanswered.

The black boxes will provide cockpit conversations and data related to the plane's engine and control settings to investigators and help them in determining the cause of the crash.