The prison is operated by Iraq's Interior Ministry.
The government says it is investigating whether the detainees were abused while in government custody.
The Iraqi government has been facing pressure over its rights record since November, when U.S. troops found a secret prison run by the Interior Ministry. The prison held 173 prisoners, many of whom said they had been tortured.
(Reuters)
Iraqi Legislative Elections 2005
Iraqi Legislative Elections 2005
RFE/RL's coverage, background, and analysis of Iraq's December 15, 2005, legislative elections.
