US armored troops prepare to launch an all-out offensive on Iraq's rebel-held city of Fallujah, Nov. 9. The US Marines backed by Iraqi forces entered the centre of the city. This is the second large-scale assault they have launched on Fallujah within the last seven months. (Xinhua/Reuters Photo)

US soldiers make preparations before attacking Iraq's rebel-held city of Fallujah, Nov. 9. US forces, backed by Iraqi troops, kicked off an all-out offensive on Iraq's rebel-held city of Fallujah Monday evening just after Iraq's interim Prime Minister Iyad Allawi signaled the green light to US-Iraqi forces to neutralize insurgents in Fallujah. (Xinhua/Reuters Photo)

On the outskirts of Iraqi city of Fallujah, US forces and Iraqi troops march towards Fallujah city, Nov. 9. (Xinhua/Reuters Photo)

A US helicopter lands on a clearing near Fallujah railway station, Nov. 9. (Xinhua/Reuters Photo)