Smith's admission means there's now no independent way to determine the accuracy of the Downing Street Memo, i.e., whether he made any typos or transcription errors that could have changed the memo's meaning.

The revelation has conjured up memories of the CBS News forged document scandal last year, where anchorman Dan Rather argued that damaging records he obtained from President Bush's National Guard file were essentially accurate, even though they had been faked by his source.

While British officials hadn't disputed the authenticity of the Downing Street Memo, a senior member of the Blair government who reviewed the memo in light of reporter Smith's admission could say only that its contents "appeared authentic."

That official, however, requested anonymity, refusing to make an on-the-record endorsement of the memo's accuracy.

New questions about the authenticity of the Downing Street Memo come at a particularly awkward time for Democrats in America. Only last week, House Democrats staged a mock impeachment hearing based on the re-created document.

Former presidential candidate John Kerry announced on June 2 that he intended to confront Congress with the Downing Street Memo, believing at the time that the document's authenticity was beyond reproach.

"I think it's a stunning, unbelievably simple and understandable statement of the truth and a profoundly important document that raises stunning issues here at home," he told a reporter.

Last week, a Kerry aide said his boss was sending a letter to President Bush demanding that he answer questions about the fake memo.

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