Swiftly melting snow triggered the worst recorded flooding in Russia’s Ural Mountains, forcing thousands of people to flee their homes as some of Europe’s biggest rivers swelled to bursting point.

Russia declared an emergency in the Orenburg region near Kazakhstan after the Ural river, Europe’s third longest river, swelled several metres in hours on Friday, and burst through a dam embankment in the city of Orsk.

The river, which rises in the Ural Mountains and flows into the Caspian Sea, will reach dangerous levels on Monday in Orenburg, a city of 500,000 down river from Orsk, and the peak is expected there on April 10, Russia’s emergency ministry said.