Investigators in southern Russia on Sunday were probing the causes of a FlyDubai passenger jet crash that killed all 62 people on board, as emergency workers at the site wrapped up the salvage operation.

The Boeing 737, which flew from Dubai to the southern Russian city of Rostov-on-Don, exploded into a fireball early on Saturday after missing the runway in bad weather as it was reportedly making its second attempt to land after circling for several hours.

Investigators confirmed that all 55 passengers and seven crew - including nine different nationalities, with 45 coming from Russia - died instantly and launched a criminal probe into whether pilot error, a technical fault or poor weather was to blame.