Senior UK Government figures no longer believe weapons of mass destruction will be found in Iraq, the BBC has learned.
BBC political editor Andrew Marr said "very senior sources" in Whitehall had virtually ruled out the possibility of finding the weapons.
They believe they did exist - but were hidden or destroyed by Saddam Hussein before the war.
Downing Street said earlier that the prime minister stood by what he told the Commons on Tuesday - that he was convinced that evidence of Iraq's weapons programme would be found.
Does it still matter if weapons of mass destruction are found? Tell us what you think
This debate has just been published. You comments will appear here shortly