The brother of Iranian President Hassan Rouhani, Hossein Ferydoun, has been detained, a judiciary spokesman says.
Mr Ferydoun failed to meet the bail terms on unspecified financial issues and was taken to prison.
He has previously been linked to officials at the center of a scandal involving inflated salaries for managers at the state insurance firm. He has always denied any wrongdoing.
The judiciary spokesman, Gholamhossein Mohseni-Ejeie, said: "Multiple investigations have been conducted regarding this person [Mr Ferydoun], also other people have been investigated, some of whom are in jail.
"Yesterday, bail was issued for him but because he failed to secure it he was referred to prison."
Mr Ejeie said Mr Ferydoun would be "released once he provides the bail".
It has not been made clear on what charges Mr Ferydoun has been detained.