US Ambassador to Iraq Ryan C. Crocker is of opinion that Iran is meddling in Iraq and has started a proxy war like Lebanon to fight US and Iraqi forces. The US officials are asserting that Iran is supply weapons to militias in Iraq. I would like mention here that Ambassador. Crocker offered no direct evidence.

Critics are saying that US is trying to use Iran to justify their presence in Iraq. I agree with them.
The US should remember that it is not a savor of Iraq people. It invaded the country occupy Iraq's oil wealth. Iran is only taking advantage of the mess created by the US.