Worries over terror have promted Great Britain to raise their terror alert to "critical" meaning there is an "imminent" terror attack.. While the three attempts at terror failed--two car bombs that never went off yesterday and the flaming SUV attack in Scotland--it's clear that authorities have a belief that another attempt is on its way.. a concert to mark the 10th anniversary of Princess Diana's death tomorrow is scheduled--and scores of authorities are also scheduled to be there to patrol..

Prime Minister Brown told Brits to remain strong..

And more from the THE INDEPENDENT:

""The danger here is that we are entering the era of the car bomb," said an intelligence source. "In the past, al-Qa'ida-style terrorists have used high-explosive bombs aimed at symbolic, high-profile targets," he said, but that might have changed out of necessity. "It's easy to make a gas and nail car bomb without raising suspicion."