After the USG conducted bombing raids inside Iraq's borders, a number of Iraqis have beseiged the USG "embassy" and have entered the "green zone" (archived). Despite Dubya Bush declaring "mission accomplished" and Hussein Bahamas "withdrawing US troops", the USG's insistence on continuing to conduct combat and bombing operations inside Iraq doesn't sit well with Iraqis. It doesn't seem to sit well with the "democratic" government the USG insisted on installing in Iraq either. They seem to increasingly view Iran as a more important regional partner than the USG ever was.
The USG "embassy" in Iraq sits on 104 acres and was built at an uncertain cost with a lower bound of 750 million USD for 2009 USD values. Since the locals moved towards taking the compound the USG has initiated measures including ordering an evacuation, deploying more troops, and having Apache attack helicopters fire flares at the crowds.