Defense Secretary Ash Carter is in Iraq for talks on the U.S.-led campaign against the self-proclaimed Islamic State. His trip comes amid revelations the United States has overlooked killings and torture by Shiite militias sponsored by the Iraqi government. Reuters reports both Iraq and the U.S. military launched investigations following the discovery in 2005 of a secret Baghdad prison where 168 prisoners were found in horrific conditions. Neither report was ever published. The U.S. report, obtained by Reuters, found evidence of extrajudicial killings and torture, and implicated top Iraqi officials who remain in positions of power.