Arabic television station Al Jazeera said on Sunday a senior Baath Party member on the US list of most wanted Iraqis had been captured.
"Iraqi police have arrested Muhammad Zimam (Abd al-Razzaq al-Sadun), former Baath Party chairman and commander of the Baath Party militia in Baghdad...who is number 41 on the US wanted list," Al Jazeera reported.
The television showed footage of a man it said was Sadun, sitting in a room appearing startled and clothed in traditional Iraqi dress.
"The arrest came after tracking him for 10 days based on intelligence information and came as part of co-ordination between Iraqi police and US forces," the television's correspondent in Iraq said.
His capture would bring to 44 the number caught by US forces since US authorities issued their "most wanted" deck of cards portraying the faces of those it wished to capture.
Saddam Hussein's former lieutenant, Izzat Ibrahim al-Douri, is the highest-ranking official on the total list of 55 who remains at large, coming in at number six.