A passenger jet has crashed in the southern Russian city of Rostov-on-Don with at least 55 passengers and six crew on board, officials say.
The FlyDubai Boeing 738, coming from Dubai, missed the runway as it attempted to land, according to reports.
It is not clear what caused the crash but poor visibility and high winds are being considered as a factor.
Unconfirmed reports say everyone on board was killed.
There were reports of a fire or an explosion on board.
Other flights have been diverted away from the airport.
About 100 rescue workers are at the site of the crash and the fire has been extinguished, media reports say.