Iran’s defeated opposition presidential candidate has said that some protesters held after last month’s disputed poll were tortured to death in prison.
The claim by Mehdi Karroubi comes days after he said a number of prisoners, both male and female, had been raped.
Officials deny the rape claims, but admit that abuses have taken place.
The BBC’s Jon Leyne says the opposition uses the issue to maintain political pressure without directly questioning Mahmoud Ahmadinejad’s poll victory.
