A preliminary assessment in last month’s disaster focusing on fuel being cut to both engines only deepened the mystery for people grieving loved ones.

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

The report highlights a critical finding: two engine fuel control switches transitioned to 'CUTOFF' moments after lift-off. A perplexing recorded exchange between pilots, where one asks about the fuel cut-off and the other denies it,