It's the fourth anniversary of a deadly attack on the London transit system, and it's been marked by the unveiling of a memorial in a city park.
Families of terrorist victims joined lawmakers and British royalty at the memorial, which features 52 steel pillars -- one for each victim of the attacks.
The colums stand 11 and a-half feet tall in London's Hyde Park.
Prince Charles told the people gathered that the date is "etched vividly" in the minds of Britons.
Some relatives of the victims left single roses next to a plaque, as the names of those who died were read aloud.
A woman whose husband died says the memorial is "very fitting."
Meanwhile, British lawmakers are warning that the city's subway
and bus network is still extremely vulnerable to attack by terrorists.
But transit operators say they've made major improvements to security.
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