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Wednesday, 12 September, 2001, 22:31 GMT 23:31 UK
UK death toll 'may reach hundreds'
The number of British casualties caught up in the terrorist attacks in the US could run into hundreds, Downing Street has said.
A spokesman said there had been a "massive" number of calls to Scotland Yard's casualty bureau, which is being run on behalf of the Foreign Office.
Mr Blair had already branded the US terror atrocities as an attack on the entire democratic world.
A Downing Street spokesman warned the death toll of Britons caught up in the attacks could be high.
He said: "As a result [of the calls] it is feared that the death toll of British citizens could run into hundreds."
It has emerged that a young British merchant banker rang his family from the World Trade Center just after the first plane hit, and has not been heard from since.
Derek Sword, 29, from Dundee was on the 89th floor of the south tower and is missing.
It is understood Mr Sword's fiancée is in New York checking hospital admission lists trying to find him.
Security precautions remain in place across the UK and Parliament is being recalled on Friday - the same day as an EU-wide day of mourning.
Earlier, as the flags flew at half mast in Downing Street, Mr Blair pledged concerted international action to identify and dismantle the "machinery of terror" and confirmed Parliament was being recalled from its summer break.
On Wednesday night the North Atlantic Treaty Organisation invoked Article Five of its treaty, saying that an attack on a member state is an attack against the 19-nation alliance.
Nato Secretary General George Robertson said this meant that the United States had the support from its Nato partners for military action if it is determined that the attacks were directed from abroad.
Meanwhile Chancellor Gordon Brown pledged that the financial world would show resilience in the face of terrorism and would take the necessary steps to ensure economic stability.
"The terrorists should know that we will never surrender or succumb to terrorist attacks on the financial community," he said.
Prince Charles said the victims and their families were in his prayers, recalling his own feelings when his uncle Lord Mountbatten was killed by the IRA.
Home Secretary Jack Straw urged all citizens of the 15 European member states to abide by a three-minute silence from 1100BST as he emerged from a meeting with his EU counterparts.
In an unprecedented move the US National Anthem will be played during a special changing of the guard ceremony to be held at Buckingham Palace at 1130BST on Thursday.
Members of Parliament will return to Westminster on Friday morning to hear a statement from Mr Blair and to debate the implications of the atrocities.
The terrible waiting game being faced by friends, colleagues and families of the missing was underlined by London-based company Risk Waters.
They said they had been unable to establish the whereabouts of any of the attendees at a conference it was holding on the 106th floor of the World Trade Center when the attacks were launched.
Mr Blair stressed Britain's solidarity with America.
Parliament has been recalled on 18 occasions since 1948 and it will prove a testing moment for the new leader of the Conservative Party, who is due to be named on Thursday.
Mr Blair, who spoke after the media conference to President George Bush by telephone for 20 minutes, also welcomed Muslim condemnation of the attacks.
All government buildings, military bases and financial institutions have been placed on red alert and British people abroad have been advised to take extra precautions over their personal safety.
About 1,000 extra police officers have been deployed on the streets of London "to reassure the public".
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