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Summary:
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. In late 2007, the Administration noted a decrease in Iranian weapons shipments, but there is debate in the Administration over whether this was driven by U.S. policy toward Iran, including interdiction as well as bilateral diplomacy on Iraq stabilization, or an Iranian re-evaluation of its own strategy in Iraq. This report will be updated. See CRS Report RL32048, Iran: U.S. Concerns and Policy Responses.