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Thirty people taking part in a yoga session have been arrested during a private class in Iran, reports suggest, causing a buzz across the country's social media.
They were detained at a private residence in the northern city of Gorgan, where they were apparently taking part in a mixed class.
Local justice department official Massoud Soleimani said the instructor, who was also arrested, had no licence to run the class and had advertised the event on Instagram.
He also said that those taking part were wearing "inappropriate outfits" and had "behaved inappropriately", the Tasnim news agency reports.
The Islamic establishment in Iran does not allow any mixed-gender sports activities.
Professional-level yoga teaching is also banned in the country.
Mr Soleimani, the deputy chief of the Islamic Revolution Court in Gorgan which is the capital of Golestan Province, did not give any more details about the attire or behaviour of the detained group.
He did say that security forces had been monitoring the residence for some time before making the arrests.
