Douri, a former Iraqi vice president and one of the most wanted men in Iraq, became the leader of the Baath Party following the 2006 execution of Saddam Hussein. U.S. officials during the waning stages of the war said they believed he was leading the Iraqi insurgency.
Iraqi counter-terrorism officials announced the arrest of Hussein Khazraji, one of the Douri's aides, during a raid in the town of al-Dour, about 80 miles north of Baghdad, pan-Arab daily Asharq al-Awsat reported Thursday.
The U.S. military in 2005 put a $10 million bounty out for the former vice president's arrest. The report Thursday said he appeared in a video in January expressing support for a Sunni-led uprising against Shiite Prime Minister Nouri al-Maliki.
There have been uncorroborated reports that he was either captured or died from leukemia.
The former vice president took temporary refuge in Yemen shortly after the U.S. invasion of Iraq in 2003.