Day of mourning

Countries throughout the world observe a day of mourning. In Europe, millions of people joined a three-minute silent tribute. In the US, President Bush, former presidents and military personnel attended a memorial service in Washington DC.

Click on the links for BBC coverage of how the world marked a day of mourning.

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Silence across Europe

A policeman looks on as mourners gather outside St Paul's Cathedral, London

At 1100 BST, cities across Europe came to a standstill as a three minute silence was observed. In the UK, the Queen and the Prime Minister, Tony Blair, later joined mourners for a service in St Paul's Cathedral.

 The BBC's Justin Webb reports
 The service at St Paul's Cathedral

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President Bush offers the nation's deepest sympathy to the relatives of those who died

America mourns its dead

Addressing the congregation at a national prayer meeting in Washington DC, President Bush said the country had been attacked with deliberate and massive cruelty.

 Click here to watch

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Bill Clinton visits New York

Former President Bill Clinton hugs a boy while on his way to a vigil in Washington Square, New York

New Yorkers awoke to their third day of mourning. Former President Bill Clinton visited Manhattan to comfort the bereaved. He listened to stories of grief as he walked among mourners on the city's streets.

 The BBC's Duncan Kennedy reports

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Special service - special relationship

There was a two minute silence

In perhaps one of the most poignant gestures of the week, the traditional changing of the guard at Buckingham Palace was altered, with the band ordered to play the American, rather than the British, national anthem.

 The BBC's Niall Dixon reports