Drudge is quoting UK papers and sources that security services are on high alert for another attack. If true, I doubt it would happen before Monday’s AM rush hour. Hopefully this is not true. Or they can catch these animals before they can do more damage.

UPDATE:

More on this in Monday’s Guardian, which also ties into the theories surrounding the lone bus bomb.

It was reported last night that Britain’s security alert had been raised to its highest level – “severe specific” alert – by the joint terrorist analysis centre. The upgrading makes it clear that the security services believe that the perpetrators of the attack are still at large.
Officials indicated that the three synchronised bombs on the underground were placed by individuals who then fled, leading to a warning from the home secretary, Charles Clarke, of possible further attacks as the total of dead was expected to reach 60.
The key to the investigation is now seen to lie in the bomb on the bus, which went off about an hour after the underground Explosions, killing 13 passengers as the bus passed through Tavistock Square. Police are now almost certain the tube bombs were not suicide attacks, but were positioned at the doors of carriages before the perpetrators got off.

Among the theories being examined about the bus bomb yesterday is that it may have been a deliberate tactic to cause maximum mayhem as those fleeing the tube boarded buses. Another theory is that the device went off by accident as the bomber tried to make his way to another target.

The New Zealand Herald has a story on possibly 30 potential suspects in the bombing in London.