|A bus ripped apart by a bomb in Tavestock Square, central London.
Prime minister Tony Blair, who is travelling from Gleneagles to London, promised that the G8 would continue.
London Mayor Ken Livingstone, speaking as he left the Olympic awards in Singapore, said it was not an attack on G8 but an attack on ordinary Londoners.
The government said there had been four explosions had taken place on the London underground shortly before 9am this morning. Hundreds of injured people were taken to hospital. The number of fatalities is not known, but is said to be at least ten.
Livingstone said: “Innocent people going from all of London's communities have been targeted by this indiscriminate attack.
|Commuters affected by the attacks
“I urge Londoners from all of this city's diverse communities and faiths to support one another and stand together against terrorism.”
There are unconfirmed reports of “dozens” of dead.
The entire tube network was shut down and buses were suspended in 'zone one'.
The Royal London Hospital admitted over 180 A&E patients, many suffering from 'pressure' injuries consistent with an explosion, such as burns, perferated eardrums, smoke inhilation and broken bones.
Karen Chouhan, chief executive of The 1990 Trust, said: “All our hearts go out to everyone who has been injured, and the families and friends of those who have died.
| Have Your Say
“These horrific attacks will acheive nothing but pain and misery to innocent people. All of London's diverse communities will be outraged.
“Previous terrorist have led to a rise in Islamaphobia and anti-Muslim sentiment. This must not happen in London. We must guard against creating further victims.
“We must stand united to condemn the attacks and to bring to justice those responsible using a robust and intelligent approach, not based on reactionary kneejerk response.”
The Muslim Council of Britain expressed strong condemnation at the attacks. Sir Iqbal Sacranie, MCB Secretary General, said: “We watch aghast as we witness a series of brutal attacks upon our capital city.”
In a statement the Muslim Association of Britain expressed its disgust with the “contempt in which the perpetrators appear to hold human life.”
They added: “Islam holds the sanctity of human life in the highest possible regard and shedding the blood of an innocent person is seen as a crime most heinous and repulsive.
“We calls on Muslims everywhere to be clear and strong in declaring the fundamentals of Islam which emphasise the principles of peace, justice and humanity.”
The first blast was reported at 8:49am. There were at least four explosions, with attacks on the tube system between Aldgate and Liverpool Street; Russell Square and Kings Cross; and at Edgware Road station; and on a bus in Woburn Place.
Sir Ian Blair, the Metropolitan Police Commissioner, had earlier said there had been at least six explosions, but said the picture was still “very confused” and expressed concern that this was “a co-ordinated attack.” A Scotland Yard official said traces of explosives had so far been found at two of the blast sites.
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