Residents have been evacuated from Sochi in Russia after flash flooding submerged part of the city that staged the Winter Olympics in 2014.

Several hours of torrential rain brought trains to a standstill and rendered roads impassable in the Black Sea resort.

Sochi international airport had to be closed and a Formula 1 circuit in the nearby Adler district was flooded.

A state of emergency was declared but there were no reports of casualties.

“There’s no water, no gas, no electricity. They say it could be back tonight or maybe tomorrow,” Alla Atakyan, a resident of Adler, told Reuters news agency