British Prime Minister Tony Blair rejected charges that his government doctored evidence on Iraq's weapons of mass destruction, leading a chorus of defensive comments Monday from America and its allies about their key justification for the war.

Top officials from the United States, Australia and Great Britain stood firmly behind the case for war, in remarks from Rome, Malaysia and the Group of Eight (search) summit here.

"I stand absolutely, 100 percent behind the evidence, based on intelligence, that we presented people," Blair said during a news conference on the sidelines of the G-8.

Accusations that his government had manipulated evidence were "completely and totally false," Blair said.

Blair and President Bush insisted in the run-up to the war that the existence of evidence of a powerful arsenal of weapons of mass destruction in Iraq justified military action against Saddam Hussein.

But the failure of American and British troops so far to uncover new evidence that Saddam had banned weapons is creating a political problem for Blair in Britain that threatens to undermine his international credibility.

The G-8 is primarily about economic issues, but Iraq and the dispute that preceded the war loomed large here.

French President Jacques Chirac was the leading foe of the war, but he and Bush tried Monday to paper over their personal rift.

"When it came time to focus on a free Iraq, a healthy Iraq, a prosperous Iraq, we're in agreement and we'll move together," Bush said, standing next to Chirac.

Chirac said the nations had a "solid basis" for cooperation on Iraq, in the form of a U.N. resolution lifting sanctions against Baghdad.

In Rome, Secretary of State Colin Powell gave a lengthy defense of the case the United States made on Iraq's weapons. "It wasn't a figment of anyone's imagination," he said Monday at a news conference with Italian Foreign Minister Franco Frattini.

"What we have to do now is not get trapped in the long-winded debate about what was known and not known," he said.

At a news conference in Penang, Malaysia (search), the defense ministers from Britain and Australia said intelligence pointing to illicit weapons in Iraq justified the invasion.

British Defense Minister Geoffrey Hoon (search) said : "We've made clear that we stand by our belief that weapons of mass destruction are there and we continue to make determined efforts to identify them."

He pointed to two vehicles found recently in Iraq that are being investigated as possible mobile biological weapons laboratories.

The two vehicles "can only be used for the production of biological weapons," he said, adding: "I'm not sure how much stronger evidence you require of a capability to produce some of the world's most appalling weapons."

Australian Defense Minister Robert Hill said there was a "mass of evidence" about Saddam's weapons of mass destruction that was "publicly acknowledged across the world."

But he conceded to some holes in the coalition's intelligence.

"What we didn't know was the full extent to which the weapons program had been further developed; we didn't know the full extent to which some may have been dismantled, and we will establish that full picture in the full course of time," Hill said.

The news conference followed biennial talks on a defense agreement between Britain and four of its former colonies — Australia, Malaysia, New Zealand and Singapore.