U.S. air strikes destroy hospital in Falluja

• A hospital has been razed to the ground in one of the heaviest US air raids in the Iraqi city of Falluja.
• A nearby medical supplies storeroom and dozens of houses were damaged as US forces continued preparing the ground for an expected major assault.
• It is the third time since the end of the US-led war that US and Iraqi forces have tried to gain control of Falluja.
• They say militants loyal to top al-Qaeda suspect Abu Musab al-Zarqawi are hiding there.
• Zarqawi's supporters have been behind some of the worst attacks on coalition and Iraqi forces as well as dozens of kidnappings.
• US troops using 155mm howitzers pounded a number of pre-planned targets in Falluja on Saturday.
• Along with air strikes - one of the heaviest in recent days - this is all part of what appears to be a steadily increasing pressure on the insurgents, says the BBC's Paul Wood, who is with US marines outside Falluja.
• Overnight, a column of armoured vehicles and humvee jeeps carried out attacks in the outskirts of Falluja designed to draw out the rebels and provide fresh targets for the air power and artillery.
• These are the kind of preliminary operations which would be carried out before a full-scale assault on Falluja, our correspondent says.
• US marine officers say the full-scale attack will go ahead only once Iraqi Prime Minister Iyad Allawi has given the order.
• In a letter to the leaders of the US, UK and Iraq, UN Secretary General Kofi Annan warned that the use of force risked alienating Iraqis when their support for elections was vital.
• He said if Mr Annan thought he could prevent insurgents in Falluja from "inflicting damage and killing", he was welcome to try.