The United Nations disputes Iraq's claim to have destroyed 21,000 litres of biological warfare agents, according to a draft of a report obtained by Reuters.
Iraq had declared 8,445 litres of anthrax, but the report estimates that 21,000 litres of germ agents stored in bulk during the 1991 Gulf War included about 10,000 litres of anthrax.
The report gives 29 "clusters" of weapons programmes and a "to do" list for Iraq to satisfy UN Security Council demands that Baghdad account for its weapons of mass destruction programmes.
The 167-page report was drawn up by the UN Monitoring, Verification and Inspection Commission (UNMOVIC), headed by Dr Hans Blix, and will be distributed to ministers at a key meeting today. It is separate from an oral report he will present.
Dr Blix also questioned Iraqi statements that it had stored all bulk biological warfare agents during the 1991 Gulf War at the Al Hakam plant and destroyed those unused after the war.
"There is credible information available to UNMOVIC that indicates that the bulk agent, including anthrax, was in fact deployed during the 1991 Gulf War," the report said. "The question then arises as to what happened to it after the war."
"Based on this information, UNMOVIC estimates that about 21,000 litres of biological warfare agent was stored in bulk at locations remote from Al Hakam. About half of this, about 10,000 litres was anthrax," Dr Blix wrote in the report.
Dr Blix said Iraq needed to provide documentation or other evidence to support its account.
The new report also said Iraq may be producing more banned missiles in addition to the Al Samoud 2 rockets it is now destroying and had declared last year to inspectors.