In pictures: Britain's grief
As American people attempt to come to terms with the enormous consequences of Tuesday's terrorist attacks in New York and Washington, Britons send condolences and messages of support. 
Foreign Secretary Jack Straw said on Thursday that more than 100 Britons were believed to have been killed in the attacks.
Mourners gathered at Buckingham Palace for a special ceremony of remembrance
Prince Andrew represented the Queen - still at Balmoral - and was joined by US ambassador William Farrish
The American national anthem was played at the altered Changing of the Guard at the suggestion of the Queen
The Queen is returning to London in time for Friday's remembrance service at St Paul's Cathedral
Flowers surround the US Embassy in Grosvenor Square
Hundreds of Britons have left messages of condolence and support.
The Lloyd's of London insurance market kept a minute's silence marked by the ringing of the Lutine Bell