The US started construction of a wall in Baghdad to try and separate Sunnis from Shi'ites in a mixed neighborhood, in a vain attempt to stop them from killing each other. So, naturally, the Prime Minister of Iraq ordered a halt to the construction of the wall, while pronouncing that Iraq is not in fact embroiled in a civil war.
I guess the wall would have been too close to an admission that the US experiment in gunbarrel democracy is a complete failure.