An official report on the world’s deadliest aviation accident in a decade, seen by CNN, has answered one key question – but raised others.

By Aditya Kalra, Allison Lampert and Abhijith Ganapavaram NEW DELHI (Reuters) -A preliminary report depicted confusion in the cockpit shortly before an Air India jetliner crashed and killed 260 people last month,

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.