UK Prime Minister Tony Blair said it was "reasonably clear" there had been a series of terrorist attacks.All London Underground, bus and train services have been suspended. The London police advices local people to stay where they are as the traffic is totally disrupted.
He said it was "particularly barbaric" that it was timed to coincide with the G8 summit. He is returning to London.
Our thoughts go out to the victims of this brutal attack.
More news updates can be found at BBC. The origin of the attacks isn't certain yet but it is believed that al-Qaeda might be involved.