From The Guardian.
US warning of commando terror attacks in Europe irritates European officials, who say no evidence plot is imminent
...European officials again made it clear yesterday they were "irritated" with the US for leaking stories before they could gather more intelligence. There was no evidence that a plot was imminent, and intelligence was described by a well-placed Whitehall official as "ill-defined"....
A Prison Planet article has some more information on the subject.