A photo of a men's cubicle with twin toilets at a Sochi Olympics venue has caused a Twitter storm in Russia.

The picture from the Biathlon Centre tweeted by the BBC’s Moscow correspondent Steve Rosenberg was picked up by opposition leader Alexei Navalny among others.

Mr Navalny queried how the budget for the games, said to be $50bn, had been spent.

Elsewhere, the photo caused disbelief and much hilarity, with some linking it to the recent debate over gay rights.

Retweeting the photo, Mr Navalny commented: "This is a men's toilet in a Sochi Olympics media centre for 1.5bn roubles [$45m]."

Others joked about Russia's controversial law on "gay propaganda", which led to calls from international campaigners to boycott February's games.

"This is how they understand the needs of sexual minorities," was one quip.

Noting there was one toilet roll between two in the cubicle, another tweeter wrote: "Tear off some paper before you sit down."

The Biathlon Centre was completed nearly two years ago, with investment from the Russian state gas company Gazprom.

While the sight of twin toilets is unusual in European parts of Russia, it is not unknown, as Russian journalist Nikita Likhachev revealed, blogging about the story for Russian news website Tjournal.