An Iranian bodybuilder has been arrested after publishing selfie of her muscles on social media which were deemed to be 'nude'.

The woman, who is accused of breaking the Islamic Republic's strict rules on nudity, has been locked up in prison because she was unable to post bail of two million rials (£50), according to the Mizanonline news agency.

She has not been identified but it is thought she may be Shirin Nobahari, one of two women who took part in an international competition and were reported in September to have been warned about selfies which they posted afterwards.

Shirin Nobahari (pictured) posts numerous pictures on her Instagram account of her showing off her biceps. Her clothing, including bear arms, would be deemed 'unIslamic' in Iran

Ms Nobahari, who has 67,000 followers on Instagram, posts images and writes in Farsi

Ms Nobahari's Instagram account, which users the moniker Shirin Muscleking, contains a number of photographs and videos of her showing off her biceps and lifting weights.

The Iranian judiciary's own news agency said today: 'One of the female bodybuilders who recently published nude photographs on social networks has been arrested.'

In Iran 'nude' can refer to any woman who is not wearing a headscarf or revealing parts of her body such as arms and legs, that must be covered in public.

The identity of the arrested woman is not known but it is thought it may be Ms Nobahari (pictured), whose selfies on Instagram are certainly in breach of Iranian clothes rules

Bodybuilding is popular in Iran but few of those taking part are women

Iranian women are allowed to take part in international sporting events, but must respect strict Islamic rules on clothing at all times.

Female swimmers have to wear full bodysuits and headscarves and women footballers and athletes have to wear tracksuits and long sleeves.

There have also been incidents where female sports fans were arrested for watching male sports events.

In 2014 a British woman, Ghoncheh Ghavami, 25, was arrested and taken to Tehran's notorious Evin jail after attempting to watch a men's volleyball match between Iran and Italy.

Iranian women are routinely banned from watching football matches, including the national team's games.

The woman who was arrested was reportedly held in prison because she could not make bail

Iran is a rigidly regimented country where women in particular must conform to the rules

Bodybuilding and wrestling are popular sports in Iran. One of the country's biggest bodybuilding stars is Sajad Gharibi (pictured), who weighs 24 stone. But rules for men showing off their bodies are different to the rules applying to women