An Air India Ltd. Boeing Co. 787 aircraft traveling from Ahmedabad in India to London’s Gatwick airport crashed shortly after taking off, in what stands to be the most serious accident involving the US planemaker’s most advanced widebody airliner.

The airline said that Flight AI171 was “involved in an incident” and that Air India is “ascertaining the details.” Footage shared on social media showed a giant plume of smoke engulfing the crash site, with no reports of fatalities or survivors. The flight was carrying 242 passengers and crew, according to news agency ANI.