A cockpit recording of dialogue between the two pilots of the Air India flight that crashed last month supports the view that the captain cut the flow of fuel to the plane's engines, said a source briefed on U.

The two engines on the Air India flight shut down within one second of each other before the Boeing 787 Dreamliner crashed last month in Ahmedabad, India, killing at least 260 people, according to a preliminary report released Friday.

The head of the US National Transportation Safety Board cautioned that initial reports about last month’s Air India crash were premature and speculative. A preliminary investigation released last week by India's Aircraft Accident Investigation Bureau found confusion in the cockpit shortly before the June 12 crash,