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A terror group linked to al Qaeda has claimed it carried out a series of terror attacks on London that have left a number of people dead and hundreds injured.
Two London hospital have reported a total of 185 wounded after a series of blasts hit locations across the city on buses and Tube stations.
Metropolitan Police Commissioner Sir Ian Blair said there was evidence of explosives at at least one of the six sites.
Scotland Yard has denied reports they were warned of an attack by Israel minutes before the blasts.
Two people have been confirmed dead and at least 90 people injured in the explosion at Aldgate Station.
Prime Minister Tony Blair is returning to London from the G8 Summit in Scotland.
He said: "It's particularly barbaric that these attacks are designed to coincide with the G8 summit.
"It's important however that those engaged in terrorism realise that our determination to defend our values and way of life is greater than their determination to cause death and destruction to innocent people."
Witness, Angie, saw the bus explode in Russell Square. She said: "There were a whole lot of people around the bus. Next thing I was on the floor and there were a lot of people on me.
"I thought I was going to be crushed. The bus was ripped out at the back. It must have been a bomb."
The entire Tube network has been shut down following the blasts at Edgware Road, Kings Cross, Liverpool Street, Russell Square, Aldgate, Moorgate and Leicester Square.
One witness said the packed underground train he was on was 200 metres from King's Cross when there was a huge flash.
The train stopped and people were using umbrellas to smash windows of the trains. Passengers were led out of the train by underground staff.
He added people were milling around King's Cross covered in soot.
Sky