Here are some of the reactions to the July 7 bombings from politicians, members of the Royal Family and other leading figures on the day of the attacks.
Tony Blair, then prime minister: "When they try to intimidate us, we will not be intimidated. When they seek to change our country or our way of life by these methods, we will not be changed. The purpose of terrorism is just that. It is to terrorise people and we will not be terrorised. This is a very sad day for the British people but we will hold true to the British way of life."
The Queen: "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."
Ken Livingstone, then mayor of London: "London has been the target of a cowardly terrorist attack. Londoners have responded calmly and courageously. On behalf of all Londoners, I want to express my deepest sympathies to the families and friends of those who have been killed and to all of those who have been injured."
Michael Howard, then Tory leader: "I entirely support what the Prime Minister has said about our determination to protect and defend our way of life. It is important that everyone should know that this country is completely united in our determination to defeat terrorism and to deal with those who are responsible for the appalling acts which we have seen today."
Charles Kennedy, then leader of the Liberal Democrats: "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."
The Rt Rev Richard Chartres, Bishop of London: "This is a grave day for London. Our thoughts and prayers are with the injured and bereaved and also with the emergency services who have responded so rapidly."
Prince William: "I was shocked and very saddened to learn of the terrible events that had occurred in London."
Jack McConnell, then Scotland first minister: "I had planned today to have a conversation with Ken Livingstone to congratulate him on the success of London yesterday in winning the Olympic Games for 2012. Instead I have sent a message of condolence."
In pictures: The 10th anniversary of the 7/7 London bombings
In pictures: The 10th anniversary of the 7/7 London bombings
1/26 7/7 bombings anniversary
Security staff and workers from Hyde Park observe a minutes silence at the 7/7 memorial in Hyde Park
2/26 7/7 bombings anniversary
People pause for a minutes silence at Kings Cross Underground station in London, as Britain remembers the July 7 attacks amid a welter of warnings about the enduring and changing threat from terrorism a decade on
3/26 7/7 bombings anniversary
Members of staff working within the grounds observe a minutes silence to commemorate the tenth anniversary of the July 7 terrorist attacks at the All England Lawn Tennis and Croquet Club, Wimbledon
4/26 7/7 bombings anniversary
Police officers within the grounds observe a minutes silence to commemorate the tenth anniversary of the July 7 terrorist attacks at the All England Lawn Tennis and Croquet Club, Wimbledon
5/26 7/7 bombings anniversary
Representatives from 7 Company, Coldstream Guards and HQ London District join the national act of remembrance for the 7th July bombings 10th year anniversary beside the Ministry of Defence Main Building in central London and led by Rabbi Major Reuben Livingstone
6/26 7/7 bombings anniversary
People observe a nationwide minute's silence on the 10 year anniversary of the 7/7 London attacks which killed 52 people, facing in the direction of a plaque and flowers laid at the location of where a suicide bomber blew themselves up during the morning rush hour on a bus in Tavistock Square
7/26 7/7 bombings anniversary
George Psaradakis (centre), the driver of the number 30 bus which was blown up in Tavistock Square, looks at floral tributes left close to the scene of the bombings in London
8/26 7/7 bombings anniversary
People stop to observe a minute's silence at Aldgate underground station, in memory of the victims of the July 7 bombings
9/26 7/7 bombings anniversary
Flowers left by the July 7 memorial plaque at Aldgate Station, London, which names those who were killed in the bombings at the station
10/26 7/7 bombings anniversary
Members of various religious groups pray during a service in St Paul's Cathedral, to commemorate the tenth anniversary of the London Bombings in London
11/26 7/7 bombings anniversary
Poppy petals fall from the roof during a service in St Paul's Cathedral, to commemorate the tenth anniversary of the London Bombings in London
12/26 7/7 bombings anniversary
A police officer looks at flowers left at Kings Cross Underground station in London
13/26 7/7 bombings anniversary
Flowers left by the July 7 memorial plaque at Aldgate Station
14/26 7/7 bombings anniversary
Boris Johnson and David Cameron place wreathes at the July 7 memorial in Hyde Park, London
15/26 7/7 bombings anniversary
David Cameron and Boris Johnson take part in a wreath laying ceremony in London's Hyde Park, in memory of the 52 victims of the 7/7 London attacks
16/26 7/7 bombings anniversary
David Cameron and Boris Johnson during a ceremony at the memorial to the victims of the July 7, 2005 London bombings, in Hyde Park
17/26 7/7 bombings anniversary
From left: Paul Crowther, Chief Constable, British Transport Police, Adrian Leppard, Commissioner City of London Police, and Sir Bernard Hogan-Howe, Commissioner of the Metropolitan Police, carry wreathes at the July 7 memorial in Hyde Park
18/26 7/7 bombings anniversary
People look at flowers left in Tavistock Square
19/26 7/7 bombings anniversary
7/7 survivor Gill Hicks (centre) arrives with flowers at Russell Square tube station
20/26 7/7 bombings anniversary
People embrace outside Edgware Road tube station, as Britain remembers the July 7 attacks
21/26 7/7 bombings anniversary
A lady carrying flowers leaves Russell Square tube station
22/26 7/7 bombings anniversary
Faith leaders promote religious unity in central London, as Britain prepares to mark 10th anniversary of the 7/7 London bombings in which 52 people were killed
23/26 7/7 bombings anniversary
Gill Hicks, (L) a survivor of the 7/7 London terror attacks, embraces police constable Andrew Maxwell outside Kings Cross Station in London, during an event to launch a walk by faith leaders promoting religious unity ahead of the anniversary of the attacks
24/26 7/7 bombings anniversary
A memorial dedicated to the 52 people that were killed during the 7/7 terror attacks in London is pictured in London's Hyde Park
25/26 7/7 bombings anniversary
The July 7 memorial in Hyde Park
26/26 7/7 bombings anniversary
A memorial dedicated to the 52 people that were killed during the 7/7 terror attacks in London is cleaned in London's Hyde Park
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