Explained: What may have caused Air India plane crash in Ahmedabad

Air India Flight 171, a Boeing 787 Dreamliner, crashed in Ahmedabad on June 12, killing 241 passengers and crew. The aircraft took off from Sardar Patel airport and was en route to London Gatwick. Shortly after takeoff, the pilot issued a mayday signal before the plane lost altitude and crashed into a hostel in Meghaninagar, resulting in a massive fireball. The cause of the crash remains unknown.