A £1m permanent memorial to the victims of the 7 July 2005 London bombings is to be unveiled in the city's Hyde Park.

Fifty-two people died and hundreds more were injured when suicide bombers detonated backpacks at four central locations on public transport.

Families of those killed will gather later to see it publicly revealed.

Relatives who have seen the 52, 3.5m (11.5ft) tall stainless steel pillars - grouped to represent the attack sites - say they form a "fitting tribute".

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