Flightradar reports that Air India flight 171 took off from Ahmedabad, but they lost the plane's signal just seconds after take off. While it was still unclear what had caused the crash, poor maintenance, a bird strike, engine failure as well as the weather were initially being suggested as the reasons.

One of the strongest pieces of evidence under review is a CCTV clip that shows the takeoff and the crash of the plane.

The Air India flight fell from the sky on Thursday and killed at least 270 people in Gujarat state, officials said Saturday.