Iran has arrested eight people working for online modelling agencies deemed to be "un-Islamic", the prosecutor of Tehran's cybercrimes court has said.
The arrests are part of an operation that has seen women targeted for posting photos showing them not wearing headscarves on Instagram and elsewhere.
Women in Iran have been required to cover their hair in public since 1979.
The eight unnamed people were among 170 identified by investigators as being involved in modelling online.
They included 59 photographers and make-up artists, 58 models and 51 fashion salon managers and designers, according to a statement from the court.
The arrests were announced by the court's prosecutor Javad Babaei during a state television programme broadcast late on Sunday that focused on the "threats to morality and the foundation of family" posed by social media.
Mr Babaei claimed modelling agencies accounted for about 20% of posts on Instagram from Iran and that they had been "making and spreading immoral and un-Islamic culture and promiscuity".
Of the 170 people found to be involved in online modelling, 29 were warned that they were subject to criminal investigation, the prosecutor added.
"The persons who reformed their behaviour after receiving a notice did not face any judicial action, and eight out of the 29 have been arrested," he said.
A spokesman of the Iranian Centre for Surveying and Combating Organised Cyber Crimes, Mostafa Alizadeh, said: "Sterilising popular cyberspaces is on our agenda.
"We carried out this plan in 2013 with Facebook, and now Instagram is the focus," he added, saying fresh operations would begin in the coming days.
There was no immediate comment from the photo-sharing site Instagram, which is owned by Facebook.