Investigators are combing the wreckage of Air India flight AI171 to determine what caused the Boeing Co. Dreamliner to crash on Thursday, killing all but one of the 242 people aboard and resulting in the deadliest aviation accident in more than a decade.

Ahmedabad fire officials reported three delegations visited the crash site. The black box's recovery is vital for the investigation. 270 bodies have been retrieved, with 80 identified. A committee will investigate the crash's causes.

Air India Flight 171 crashed into a hostel near Ahmedabad airport after a failed take-off. The pilot's distress call, reporting a lack of thrust, was the last communication received. Investigators suspect insufficient thrust caused the Boeing Dreamliner to overshoot the runway.