(RFE/RL) -- A son of Iranian opposition cleric Mehdi Karrubi has been prevented from boarding an international flight and had his passport confiscated, according to an Iranian website quoted by RFE/RL's Radio Farda
Mohammad Taghi Karrubi becomes the third of the reformist cleric's sons to have been targeted by authorities since his unsuccessful bid to unseat hard-line President Mahmud Ahmadinejad in the June election.
The younger Karrubi has commented publicly on a number of occasions since unrest began over the disputed vote.
He said the authorities who stopped him at Tehran's Imam Khomeini International Airport on March 5 and barred him from traveling provided no explanation for their move, according to the Sahamnews website
Reports suggested the younger Karrubi was bound for Britain for academic activities, including to promote his book on international law and the unilateral use of force.
He was also hoping to conduct research for a new book, the website reported.
The official response to charges of massive election fraud and street protests has included the brutal treatment of demonstrators, sweeps and mass arrests, a gag on the media, and accusations of treason and apostasy.
Another Karrubi son, Hossein, has had his passport seized by Iranian authorities, and officials have revoked the license
of a weekly magazine where he serves as managing editor, "Irandokht."
Still another son, Ali Karrubi, was detained during rallies in February and was beaten and threatened with rape while in custody, according to his mother
Authorities banned an influential newspaper reportedly owned by Mehdi Karrubi, "Etemad-e Melli," in August.