Investigators probe Russia plane crash that killed 62

The Boeing 737, which flew from Dubai to the southern Russian city of Rostov-on-Don, exploded into a fireball early Saturday after missing the runway in bad weather.

It had reportedly been making its second attempt to land after circling for several hours.

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

But the plane's two black boxes were "badly damaged", Russia's intergovernmental aviation committee said in a statement, warning that analysing them would take time.

Transport Minister Maxim Sokolov said emergency service workers had completed their "search and rescue" operation at the site, where tangled debris was spread across a wide area.

Investigators were spending the day combing the scene for clues of what caused the crash, Sokolov said, with experts from state-owned budget airline flydubai -- a sister firm of Emirates Airlines -- and the United Arab Emirates authorities aiding the probe.

Some 40 people, including air traffic controllers, officials from the regional meteorological centre, and flydubai representatives, had been questioned as part of the probe, investigators said.

Authorities also said they were starting the grisly task of identifying the collected human remains using DNA samples from relatives.

Residents in Rostov-on-Don -- a city of some 1 million around 1,000 kilometres (620 miles) south of Moscow -- laid flowers and cuddly toys at the airport entrance as they tried to digest the tragedy.

"I am from Rostov myself and although I don't personally know those killed, a lot of names are well known, it's a small city," local resident Boris told AFP.

The arrivals and departures boards in the terminal were red with cancelled flights as the airport remained closed, but deputy regional governor Alexander Grebenshchikov said it would open again at 0600 GMT Monday.

The passengers on board flight FZ981 included 44 Russian nationals, eight Ukrainians, two Indians and one Uzbek, the airline said. They comprised 33 women, 18 men and four children.

The company said the Cypriot pilot and Spanish co-pilot each had nearly 6,000 hours of flying experience.

The five other crew members were from Spain, Russia, the Seychelles, Colombia and Kyrgyzstan.

Investigators said in an initial statement Saturday that the plane had "skimmed the ground and broke into several pieces" with fragments of the Boeing 737 reportedly scattered up to 1.5 kilometres (one mile) from the crash site.

Unconfirmed security footage on Russian state television appeared to show the jet plummeting nose first into the ground at high speed before exploding.

A strong wind warning was in place and it was raining hard at the time of the crash.

Based at Dubai airport, low-cost airline flydubai has a strong safety record, although one of its planes was hit by a bullet as it landed in Baghdad airport in January 2015, prompting multiple companies to suspend flights to the Iraqi capital. No one was hurt in that incident.

Russian airports have a patchy safety history with the fatal private jet crash in 2014 that killed Christophe de Margerie, the French boss of oil giant Total, on take-off in Moscow one of a string of incidents.

Flydubai chairman Gaith al-Gaith insisted at a press conference Sunday that the airport "was good enough to operate and good enough to land as per the authorities".

Russia's aviation agency has said there was no doubt about the safety of the runway or facilities at Rostov-on-Don and brushed off any blame directed at the air traffic controllers.

The last major aviation tragedy involving Russia was in October last year, when a passenger jet on its way from Egypt's Sharm el-Sheikh resort to Saint Petersburg was brought down by a bomb in the Sinai Peninsula.