Iran's Revolutionary Guard said on Sunday that two defeated presidential contenders should be tried for inciting unrest after the disputed poll, and one of the candidates said on his website detainees had been raped in jail, Reuters reported.
The June 12 election plunged Iran into its biggest internal crisis since the 1979 Islamic revolution, exposed deepening divisions in its ruling elite and set off a wave of protests that left 26 people dead.
"If (Mirhossein) Mousavi, (Mehdi) Karoubi and (former president Mohammad) Khatami are main suspects behind the soft revolution in Iran, which they are, we expect the judiciary ... to go after them, arrest them, put them on trial and punish them," said Yadollah Javan, a senior commander of the powerful Guard, the official IRNA news agency reported.
Protests gripped Tehran and other cities after the vote, which moderates say was rigged to secure the re-election of President Mahmoud Ahmadinejad, though officials say it was the "healthiest" vote in the past 30 years.
State media say at least 26 people were killed and hundreds arrested during post-election violence. The judiciary has put some of the detainees on trial to deter further dissent.
Many of those arrested were held in the Kahrizak detention center in south Tehran, built to house people breaking the vice laws. At least three people died in custody there and widespread anger erupted as news spread of conditions in the jail.
On Sunday Karoubi said on his website that some protesters, both male and female, had been raped while in detention, and that he had written to the head of a powerful arbitration body calling for an investigation.
"Some senior officials told me that ... really shameful issues ... Some young male detainees were raped ... also some young female detainees were raped in a way that has caused serious injuries," the website quoted Karoubi as saying in a letter he wrote 10 days ago to Akbar Hashemi Rafsanjani, a former president.
A police statement issued on Thursday confirmed that serious violations took place in Kahrizak prison. The authorities said on Sunday they had jailed the head of the detention center.
"The head of the center has been sacked and jailed. Three policemen who beat detainees have been jailed as well," IRNA quoted Iran's police chief Esmail Ahmadi-Moghaddam as saying.