The US head of the team searching for Iraq's weapons of mass destruction, David Kay, has resigned.
Mr Kay has said he did not believe Iraq possessed large stockpiles of chemical or biological weapons.
He also said he did not think that there had been a large-scale production programme since the end of the first Gulf War in 1991.
Mr Kay is being replaced by Charles Duelfer, a former deputy head of the UN inspections team.
The US and Britain went to war against Iraq last year, citing a threat from Iraq's weapons of mass destruction.
