Many were left in a state of shock
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A massive intelligence investigation is under way to find those responsible for the bomb attacks in London which killed at least 37 and left 700 injured.
Foreign Secretary Jack Straw said Thursday's attacks bore all the hallmarks of the al-Qaeda network.
The Queen and Prince Charles will visit casualties in hospital while Tony Blair prepares for the G8 summit's last day.
Transport operators hope to run a near normal service on the Tube on most lines on Friday.
But the Circle and Hammersmith and City lines will remain closed.
Vigilance plea
King's Cross station was due to re-open for suburban rail services only.
Buses are expected operate normally, except around the immediate areas where the explosions took place.
Transport officials have urged passengers to remain vigilant and keep hold of their baggage at all times.
Home Secretary Charles Clarke is urging people to go about their business as normally as possible on Friday.
Anyone worried about relatives or friends they have not heard from is advised to contact a special police hotline on 0870 156 6344.
Scotland Yard have confirmed seven people died in the Liverpool Street explosion, while 21 lost their lives at the King's Cross blast and another seven were killed at Edgware Road.
Two people died in the explosion on a double decker bus at Upper Woburn Place.
It is thought the death toll could rise on Friday. Australian Prime Minister John Howard said he had information that 52 people had died.
I saw three bodies on the track - I couldn't look, it was so horrific 
One eyewitness - Scott Wenbourne - was on the train travelling in to Aldgate station when there was an explosion in the carriage in front of him.
He told of how he and other passengers were led to the station after the blast.
Describing the sight before him, Mr Wenbourne said: "As we walked up past the carriage we saw debris and torn metal. I noticed the carriage was completely ripped apart on one side.
"I saw three bodies on the track. I couldn't look, it was so horrific. I think one was moving but I'm not too sure."
BBC correspondent Frank Gardner said dozens of secret service staff at MI5 headquarters are working flat out to find out who was responsible for the four blasts which terrorised London in the space of 56 minutes.
'Soft' targets
Closely co-ordinated attacks aimed at "soft" civilian targets without warning pointed towards a group linked to, or at least inspired, by al-Qaeda, he added.
Whitehall sources say every resource is being used, but it may take some days before a picture emerges of who was to blame.
Police said they were examining a claim on the website of a previously unknown group, the Secret Organisation Group of al-Qaeda of Jihad Organisation in Europe, saying it was behind the blast.
The statement said the attacks were revenge for the "massacres" Britain was committing in Iraq and Afghanistan and that the country was now "burning with fear and panic".
It warned Denmark and Italy they faced similar attacks if they did not withdraw their troops from the Middle East.
Deputy Assistant Commissioner Brian Paddick said officers were looking into this claim, but that they were keeping an open mind.
He also stressed officials had not received any warning of the blasts.
Anti-terrorism officers are also examining whether or not the attacks were the work of suicide bombers. Mr Paddick said it was too soon to say definitively either way.
Foreign Office officials says the attacks were similar to those on the Spanish capital, Madrid, last year.
Mr Straw said the spate of attacks on the public transport system bore "all the hallmarks of an Qaeda-based organisation".
But he stressed that assessments were still being made.
The prime minister, who left the G8 summit to meet police and security officials in London after the attacks, is due to get back to business with other world leaders later.
All statements on the key issues being discussed, including steps to tackle climate change, were postponed until Friday, although negotiations continued.
The leaders did however pause to condemn what they called "an attack on civilised peoples everywhere".
Meanwhile the home secretary urged people to try to continue their lives as normally as possible.
Mr Clarke said: "The aim of the terrorists to try and stop us leading our lives as we best can and I think our responsibility is to try and get on and live our lives as we can."
No intelligence had been received of any further attacks being threatened, he added.
But the Metropolitan Police advised people to consider whether they needed to come to work.
