Air India Express 171's crash report offered no closure - just more speculation and one haunting, unexplained detail.

The U.S. assessment is not contained in a formal document, said a source, who emphasized the cause of the deadly crash remains under investigation.

A preliminary report released last week included detail about the fuel, saying that the fuel to the plane's engines appeared to have been shut off.

Earlier this week, the family of Vishwash Kumar Ramesh, the sole survivor of the incident, gave an update on his wellbeing, revealing that the heartbroken man is still haunted by nightmares of the collision, which tragically stole the life of his brother.

The aircraft has been grounded for checks, Air India added. A Times of India report, citing sources, said three tyres had burst on the aircraft after the landing. TV footage from NDTV and India Today showed the outer casing of the engine damaged, with some apparent cracks.

Authorities released a preliminary report on the Air India crash, following an investigation. The London-bound flight from Ahmedabad crashed minutes into the June 12 flight. Only one passenger of the 242 passengers and flight crew survived.

Investigators released a preliminary account of the crash, describing how the plane struggled after its fuel supply was cut.

The owners of Air India set up a public charitable trust to support victims and families of the tragic plane crash in Ahmedabad. They shared plans for the money.