I found this interesting to read, it's from the BBC
http://news.bbc.co.uk/1/hi/world/europe/4660415.stm
In quotes: World reaction
London has been hit by a series of explosions across its public transport system, killing at dozens of people and injuring many more.
World leaders and other international figures have offered their sympathy and support in the wake of the attacks.
Below are a selection of their reactions.
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US President George W Bush
President Bush insisted the war on terror would continue
The contrast between what we've seen on the TV screens here, what's taking place in London and what's taking place here [at G8 summit] is incredibly vivid to me.
On the one hand you've got people here who are working to alleviate poverty and to help rid the world of the pandemic of Aids. They're working on ways to have a clean environment and on the other hand you have people killing innocent people.
The contrast couldn't be clearer between the intentions and the hearts of those of us who care deeply about human rights and human liberty and those who kill.
Telegram on behalf of Pope Benedict XVI
Deeply saddened by the news of the terrorist attacks in central London, the Holy Father offers his fervent prayers for the victims and for all those who mourn.
While he deplores these barbaric acts against humanity, he asks you to convey to the families of the injured his spiritual closeness at this time of grief.
Upon the people of Great Britain, he invokes the consolation that only God can give in such circumstances.
Russian President Vladimir Putin
The response to these inhumane crimes wherever they take place - be it London, New York, Moscow or other countries - should be absolute condemnation.
All civilised countries should unite in the fight against international terrorism.
Spanish PM Jose Luis Zapatero
Mr Zapatero recalled the attacks in Madrid in March 2004
Spain has suffered the scourge of terrorism for decades and on 11 March last year it was the victim of the most horrific attack recorded until then in Europe.
For that reason, we, the Spanish people, well understand the suffering that today the British people are undergoing.
We share their pain intensely, just as they and so many other peoples of the world did with us on other occasions.
Rudolph Giuliani, Mayor of New York on 11 September 2001
My heart goes out to the people who were affected by this, it reminds me so much of 11 September.
I feel very sorry for them and I offer all the support and help and assistance that we can give. I was right near Liverpool [Street] Station when the first bomb went off and was notified of it and it was just to me very eerie to be right there again when one of these attacks takes place.
These are dastardly cowardly acts and the best way to react to them is to stand up to them and do everything we can to support the people that were affected by it, but not to let these terrorists affect our way of life.
Hamid Karzai, President of Afghanistan
This terrorist act is shocking and despicable. It is aimed at killing innocent civilians, and I condemn it in the strongest terms.
The Afghan people send their sympathies to the people of Britain. Afghans have suffered at the hand of terrorists for many years and understand the pain and suffering that terrorism causes.
My thoughts are with the families of the victims and those injured.
Australian Prime Minister John Howard
I express my horror and disgust at this cowardly attack on innocent people. These sorts of attacks will not alter the determination of free countries to do the right thing.
It's important that we stand shoulder to shoulder with our British allies at a time such as this.
Sheikh Rashid, Pakistan Information Minister
We condemn the attacks in London this morning. We offer our heartfelt sympathies to those who suffered due to such acts.
European Parliament President Josep Borrell
As president of parliament and a citizen of a country [Spain] that only last year experienced the horrors of such terrible attacks, I want to send a message of solidarity with British people.
We all stand with you, British people, and we will never let atrocities or terrorism defeat the values of peace and democracy.
French PM Dominique de Villepin
The French government places itself at the disposal of British authorities to bring them our assistance and our co-operation.
More than ever, our democracies must rally together and show unity in the face of the terrorist threat. More than ever, we must all show vigilance and determination.
Irish Prime Minister Bertie Ahern
This is terrorism and violence perpetrated against ordinary people.
It's just a black mark on society, a devastating blow against people.
This is a huge emergency. A terrible, sad day.
Dutch PM Jan Peter Balkenende
Terrorism is an evil that threatens all the countries in Europe. Vigorous cooperation in the European Union and worldwide is crucial in order to meet this evil head on.
Javier Solana, EU foreign policy chief
A terrible event can happen at any time. We cannot let down our guard. We are working every day, and in a co-ordinated way in all the EU countries.
Unfortunately there are times when one cannot prevent one [an attack] happening.
EU Justice Commissioner Franco Frattini
[The attacks are] a tragic confirmation that terrorism strikes once more at the heart of Europe.
It's necessary to immediately activate co-ordination between intelligence and police services and offer England all the help possible.