London will fall silent today to remember the victims of the 7/7 bombings, 52 of whom were murdered, ten years on from the atrocity.

Hundreds more were injured when four suicide bombers attacked London's transport network.

David Cameron said the Tunisian beach massacre showed the danger remains, but vowed the nation would not be cowed by violent extremists.

The Prime Minister said: "Today the country comes together to remember the victims of one of the deadliest terrorist atrocities on mainland Britain.

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Gill Hicks lost both of her legs in the terrorist attack, in which more than 700 innocent people were injured. Picture: PA

"Ten years on from the 7/7 London attacks, the threat from terrorism continues to be as real as it is deadly - the murder of 30 innocent Britons whilst holidaying in Tunisia is a brutal reminder of that fact.

"But we will never be cowed by terrorism.

"We will keep on doing all that we can to keep the British public safe, protecting vulnerable young minds from others' extremist beliefs and promoting the shared values of tolerance, love and respect that make Britain so great."

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7/7 survivor Gill Hicks hugs Pc Andy Maxwell, who came to her aid when she was injured at Kings Cross Station in London. Picture: PA

Events being held to mark the anniversary include a national minute's silence at 11.30am.

The period of quiet will take place during a service at St Paul's Cathedral - attended by the Duke of York, Mr Cameron, Boris Johnson, Tony Blair and Ken Livingstone, who was Mayor of London at the time of the attacks.

Announcements across the capital's public transport network will be halted and bus drivers asked to bring vehicles to a stop if they can do so safely.

Tube services will run as normal but passengers will be asked to observe the silence and announcements will be halted for the duration, Transport for London said.

Survivors, relatives of the dead and members of the emergency services have been invited to the event.

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The Hyde Park memorial. Picture: PA

Wreaths will be laid beforehand at the Hyde Park memorial, with Mr Cameron attending, and a second service, to be attended by the Duke of Cambridge, will take place there later - featuring music, a series of readings and the laying of flowers.

The #WalkTogether initiative will hold a walk from Russell Square Tube station at 8.45am. 

Jacqui Putnam, who survived the Edgware Road explosion, said: "It doesn't seem like ten years ago.

"There is only one group of people who I want to be with and that is my survivor family."

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Rabbi Laura Janner-Klausner, Imam Qari Asim, 7/7 survivor Gill Hicks and reverend Bertrand Olivier stand together outside King Cross St Pancras underground station. Picture: PA

Ms Putnam, from Cambridgeshire, said her overriding feeling will be sadness as she remembers the 52 people who were killed.

"I think of them as my silent friends," she said.

"Those 52 people are with me every day because I could so easily have been with them. The fact that I'm not is random luck."

On  July 7, 2005, London was elated from learning the previous day that it had won the 2012 Olympics - but within hours, the country was consumed by horror and grief.

Suicide bombers Mohammed Sidique Khan, 30, Shehzad Tanweer, 22, Hasib Hussain, 18, and Jermaine Lindsay, 19, met at Luton station that morning, and took a train to Kings Cross.

Within three minutes of 8.50am, Tanweer detonated his bomb at Aldgate, Khan set his device off at Edgware Road and Lindsay blew himself up between King's Cross and Russell Square.

Hussain detonated his device on a number 30 bus at Tavistock Square at 9.47am.

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The scene in Tavistock Square after a bomb ripped through a double decker bus. Picture: PA

Twenty-six died in the bombing at Russell Square on the Piccadilly line, six in the bombing at Edgware Road on the Circle line, seven in the bombing at Aldgate on the Circle line, and 13 in the bombing on the bus at Tavistock Square.

A fortnight later, another four would-be suicide bombers launched failed attacks on the Tube and a bus, leading to police marksmen killing innocent Brazilian Jean Charles de Menezes.

Police Commissioner Sir Bernard Hogan-Howe added: "Today is a day to remember and reflect.

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Tube driver Jeff Porter at Edgware Road station where he was driving a train on the day of the 7/7 London bombings. Picture: PA

"To remember those whose lives were taken from them, the hundreds of people injured and caught up in the horrific carnage, and all those people whose loved ones never returned home.

"It is a time to reflect upon our City, how strongly we came together to stand up to the threat we faced, and to send a message to terrorists that London was, and continues to be, strong, united and vibrant.

"For so many of my officers and staff the July 7, 2005 is a day that they too will never forget.

"A day that doing their duty meant running towards scenes of horror that were unimaginable, not knowing what would face them when they arrived and doing their absolute very best to help.

"Their actions, emergency services colleagues and the public were brave, professional and fill me with humility and pride for what they collectively delivered.

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"We will never, ever be complacent.

"Whilst I hope that we will never need to deliver such a response again, if we do we will be ready.

"My thoughts today are with those taken from us, those who were affected, remain affected and with my own men and women who, day-in day-out are here for London."