Leading Iranian opposition figure Mehdi Karroubi has said he remains defiant despite threats, and that he and his family are "prepared for any disaster".
He also accused Tehran of suppressing people in the name of religion.
Mr Karroubi, who stood in June's disputed presidential elections, also said he survived an attack last week when a car he was in was fired on.
Meanwhile, Iran's top prosecutor called for "stong action" against those behind the "post-election sedition".
Gholam Hossein Mohsen Ejeie said calls by some hardline clerics to put opposition leaders on trial should be answered, Iran's Isna news agency reported.
President Mahmoud Ahmadinejad claimed victory in the vote, but opposition leaders said the election was rigged.
The election led to a series of street protests and crackdowns.
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