Politicians and community leaders have been giving their reactions to the bomb blasts in London.
The dreadful events in London this morning have deeply shocked us all. I know I speak for the whole nation in expressing my sympathy to all those affected and the relatives of the killed and injured.
I have nothing but admiration for the emergency services as they go about their work.
PRIME MINISTER TONY BLAIR
It is important... that those engaged in terrorism realise that our determination to defend our values and our way of life is greater than their determination to cause death and destruction to innocent people in a desire impose extremism on the world.
Whatever they do it is our determination that they will never succeed in destroying what we hold dear in this country and in other civilised nations throughout the world.
FOREIGN SECRETARY JACK STRAW
These outrages bear the hallmarks of Al-Qaeda
TORY LEADER MICHAEL HOWARD
What is important is to make it absolutely clear that this country is united as one in our determination to defeat terrorism and to deal with those who are responsible for the dreadful acts that have taken place in London.
LIBERAL DEMOCRAT LEADER CHARLES KENNEDY
The people who perpetrated these monstrous attacks have no interest whatsoever in the liberty and dignity of individuals.
They deserve and receive national and international contempt.
LONDON MAYOR KEN LIVINGSTONE
This was not a terrorist attack against the mighty and the powerful.
It was not aimed at presidents or prime ministers. It was aimed at ordinary working-class Londoners, black and white, Muslim and Christian, Hindu and Jew, young and old.
Indiscriminate slaughter irrespective of any consideration for age, class, religion, whatever.
That isn't an ideology. It isn't even a perverted faith. It is just an indiscriminate attempt at mass murder.
CHIEF RABBI SIR JONATHAN SACKS
These terrible events have brought home to us the full evil that terror represents.
It is not the weapon of the weak against the strong but the rage of the angry against the defenceless and innocent. It is an evil means to an evil end.
SIR IQBAL SACRANIE, SECRETARY GENERAL OF THE MUSLIM COUNCIL OF GREAT BRITAIN
What we need to be aware is the terrorists, these evil people who have carried out this series of explosions in London, want to demoralise us as a nation and divide us as a people.
All of us must unite in helping the police to hunt these murderers down.
I think, yesterday, we celebrated as Londoners the euphoria that our great city had secured the Olympic Games.
Today, we watch aghast as we witness a series of brutal attacks upon our capital city. I think we were together in our celebrations and we must remain together in our time of crisis.
DR ROWAN WILLIAMS, ARCHBISHOP OF CANTERBURY
The appalling events in London have shocked us all.
I want first and foremost to extend my personal sympathy and condolences to everyone who is suffering and grieving at this time.
SHADOW HOME SECRETARY DAVID DAVIS
The explosions were acts of almost unspeakable depravity and wickedness - planned with the deliberate intention of taking innocent life.
RESPECT MP GEORGE GALLOWAY
We argued... that the attacks on Afghanistan and Iraq would increase the threat of terrorist attack in Britain. Tragically Londoners have now paid the price of the Government ignoring such warnings.
RAMESH KALLIDAI, SECRETARY GENERAL OF THE HINDU FORUM OF GREAT BRITAIN
Britain is a good example of a multi-cultural society where all faith communities have been living together peacefully. It is now more important than ever to ensure that we do not succumb to terrorism by allowing ourselves to be divided.