DUBAI - An Iranian official accused of involvement in the torture of protesters while in custody has resigned from his post after parliament threatened the government with impeachment, Iranian media reported on Sunday.

Saeed Mortazavi stands accused of involvement in the deaths of protesters detained at the Kahrizak detention center after the disputed re-election of President Mahmoud Ahmadinejad in 2009.

A group of lawmakers launched the impeachment motion against Labour and Social Welfare Minister Abdolreza Sheikholeslami this month after he appointed Mortazavi as the new head of the social security office.

"I suggested to him (Mortazavi) that he resign as head of Social Security Organization in order to resolve the problem ... and he accepted my proposal," a senior lawmaker, Gholam-Ali Haddad Adel, wrote in a letter to MPs, the Fars news agency reported on Sunday.

The supreme leader, Ayatollah Ali Khamenei, ordered the notorious Kahrizak detention center to be closed after an investigation revealed that three people had been tortured to death, including the son of a prominent conservative politician.

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