The threat to the UK from international terrorism has been raised from substantial to severe - meaning an attack is "highly likely".
Announcing the move, Home Secretary Alan Johnson said although the threat had increased there was no intelligence to suggest an attack was imminent. But he urged people to be vigilant.
He added that it was not specifically linked to the Christmas Day plane bomb plot or any other incident, although it comes ahead of a major counter-terrorism conference in London next week.
http://latestnews.virginmedia.com/ne...evel_at_severe