"I have absolutely no doubt at all that we will be able to show convincing and conclusive evidence of the existence of weapons of mass destruction," Blair told reporters at his monthly press conference at Downing Street.

"We are interviewing scientists and experts, and I can assure you we are getting a lot of information from them, as well as finding things like the trailers for what we believe to be mobile biological weapons laboratories," Blair said.

"I think when we present all that evidence, accumulate it over a period of time, with a process of people visiting all these sites and getting the evidence, I think it will be very, very clear," Blair said.

Britain, the United States and Spain pinned their case for war on charges that Saddam had amassed prohibited chemical and biological weapons, but US-led forces have yet to find definitive evidence of the arms.

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