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US citizens have been quick to show their support for people in the UK in the wake of London's bomb attacks.

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Many have e-mailed pictures and messages to the BBC to say their thoughts are with the British.

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The business community showed its backing for London with a message on the Nasdaq board in New York's Times Square.

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The union jack was raised outside the US State Department and then lowered to half mast as a mark of respect.

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US Secretary of State Condoleezza Rice signed a book of condolence at the British Embassy in Washington DC.

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London's experience has struck a chord with a people still coming to terms with the 11 September 2001 attacks.

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President George W Bush, in Scotland for the G8 summit, said the US would do all it could to bring the bombers to justice.