The BBC's Humphrey Hawksley, in Baghdad, says the key issue at present is exactly how American troops will withdraw within the next three years and what sort of Iraq they will leave behind.

BBC驻巴格达记者汉弗莱·霍克斯利说，事情的关键在于未来的3年内美军将以何种方式撤离，而美军撤离后的伊拉克将会处于一种怎样的状态。