Jack Straw was breaking the rules (ministers don't usually speak about intelligence matters) when he made it known that British spies have found new evidence linking Osama bin Laden to the US attacks. He refused to give any details of the evidence against bin Laden.
A spokesman for the prime minister he'd one this because 'people want to know who we believe was behind the attacks'.
Others, however, believe that Jack Straw may have gone public as a deliberate ploy to prepare the British people for miltary action in the near future.