A former Iranian vice president and chief-of-staff of hardline ex-president Mahmoud Ahmadinejad was arrested on Saturday, the website of the Tehran prosecutor said.
Esfandiar "Rahim Mashaie was arrested and is in detention," it said, without specifying the reason why he was held, Middle East Eye reports.
"His arrest is clearly a violation of the constitution...that confirms the need for fundamental reforms within the judiciary," the former president said in a statement.
His detention comes after video uploaded on social media showed Mashaie demonstrating on Thursday outside the British embassy to protest against the incarceration of another of Ahmadinejad's former vice presidents.