Amy Ryan and Greg Kinnear will join the untitled Iraq war thriller being helmed by Paul Greengrass ("The Bourne Ultimatum") for Universal Pictures reports Variety.

Set in the 'Green Zone', a walled and fortified area where U.S. troops stay during the Iraq occupation. Matt Damon plays an officer who teams with a senior CIA officer to search for evidence of weapons of mass destruction.

Ryan will play a New York Times foreign correspondent sent to Iraq to investigate the US Government's WMD claims, whilst Kinnear plays another CIA officer.

Greengrass and scribe Brian Helgeland adapted the premise from Rajiv Chandrasekaran's nonfiction book "Imperial Life in the Emerald City: Inside Iraq's Green Zone", critics say flawed decisions are made in Iraq because leaders are separated from the realities of life in war-torn Iraq.

Antoni Corone has been cast as a colonel. Shooting begins today in Spain for Universal Pictures.