Proof by response

The White House has responded to yesterday's claims that Bush wanted to bomb Al-Jazeera TV by calling the allegations "outlandish and inconceivable" - implying that they are false. But if they're false, why is the British Attorney-General threatening newspapers with prosecution under the Official Secrets Act (for "coming into posession of secret information") if they publish more on the story? And why are two men being prosecuted under that Act for leaking it?