TEHRAN - Iran briefly detained a son of an opposition leader on Saturday for criticising the government, the opposition Sahamnews website reported.
"Mohammad Hossein Karoubi was arrested today for disclosing information about the Kahrizak detention centre (where at least three detained anti-government protesters were killed)," said Sahamnews.
In a later dispatch, it added: "The son of Mr Karoubi has been released after answering some questions."
The website belongs to Mehdi Karoubi who lost to President Mahmoud Ahmadinejad in the 2009 presidential election. It gave no other details on the detention.
Since the vote, hundreds of reformists have been detained and put on trial in a crackdown on the pro-reform opposition.
The vote was followed by street protests, the most serious unrest since the Islamic Republic was founded in 1979. The state succeeded in quashing the turmoil, blaming it on "seditionists" backed by its foreign enemies.
The opposition says the election was rigged to bring back Ahmadinejad. The authorities deny allegations of electoral fraud, saying the vote was "the healthiest" Iran has had in three decades.
(Writing by Parisa Hafezi; Editing by Maria Golovnina)