"Iran is materially assisting major Shiite Muslim political factions in Iraq, most of which have longstanding ideological, political, and religious ties to Tehran, and their armed militias. Since late 2007, the Administration has noted a decrease in Iranian weapons shipments, but Iran now believes it has built significant influence over Iraqi leaders and it is building groups of extremist Shiite militiamen who do not answer to political factions. This report will be updated."
CRS Report for Congress, RS22323
U.S. Dept. of State, Foreign Press Centers: http://www.fpc.state.gov/