India, June 14 -- Two black boxes from the wreckage of the ill-fated Air India flight 171 were recovered on Friday as investigators intensified efforts to determine what transpired in those 33 seconds mid-air that caused India's deadliest aviation disaster in three decades.

Experts have raised concerns of possible technical faults, crew miscalculations, and configuration errors in the Boeing 787-8 plane.

One of the black boxes was retrieved from the rooftop of a hostel mess building near the BJ Medical College in Ahmedabad, where the Dreamliner crashed shortly after takeoff on Thursday, killing 241 people on board. The second recorder was also located on Friday, and both are now being examined for clues, officials said. Follow Ahmedabad...