The fourth anniversary of the July 7 bombings, which killed 52 people in London, will be marked on Tuesday with the dedication of the London Bombing Memorial in Hyde Park.
The memorial consists of 52 stainless steel pillars, each pillar representing one of the victims, and arranged in groups of four to represent the four locations of the bombings.
Prince Charles, Prime Minister Gordon Brown and Mayor of London Boris Johnson will attend the dedication ceremony and meet with families of the bombing, and representatives of the emergency services.
During the ceremony, the names of all those killed will be read out and followed by a minute's silence.
Johnson said: "We have done much to make London safer, but today reminds us that London's strength ultimately lies with its people."
The attacks in July 2005 took place on three underground trains at Edgware Road, Russell Square and Aldgate. A fourth bomb went off on a bus at Tavistock Square.
Johnson has provided funding for increased policing of the transport network across the city.