Commuters in London reluctantly descended into the Underground yesterday morning, while police scrambled through dangerous rail tunnels deep underground yesterday to hunt for clues and retrieve bodies after suspected al-Qaeda bombers killed more than 50 people in London rush-hour blasts.
A day after four bombs tore through three underground trains and a red double-decker bus, commuters headed to work again on London's battered transport network, some fearful, some defiant, undeterred by the knowledge it might happen again.
"My granddad called me last night and told me I had to go to work today," said Sally Higson, 36. "He's 89. He lived through the war and said it was important to carry on as normal."
"I was scared, but what can you do?" said Raj Varatharaj, 32, emerging from a subway station. "This is the fastest way for me to get to work. You just have to carry on."
Ten of London's 12 subway lines reopened yesterday, though service on three was restricted. Bus service was running through central London, except for diversions around blast sites.
Thursday's attacks -- which ministers said bore the hallmarks of the Islamic militant al-Qaeda network -- were London's deadliest in peacetime.
Sir Ian Blair, commissioner of the Metropolitan Police, said more than 50 people were killed in the blasts and 700 wounded.
He said the final death toll was not yet known. Police had yet to reach one of the bombed underground carriages in central London as the surrounding tunnel was unsafe, but Blair said no survivors were trapped underground and the task now was to retrieve bodies.
Andy Trotter of the British Transport Police said the number of bodies still trapped was not known, but one police source said it could be more than 10.
"This was a crowded tube train at rush hour in central London with several hundred people on board," Trotter said.
Andy Hayman, of the London police specialist operations branch, spoke of the "extreme circumstances" under which rescuers were working, saying they faced the hazards of tunnel collapse, vermin and "dangerous substances" in the air.
"I think we can all respect the sort of things our people are actually confronting," he said.
A maintenance worker, who did not want to be identified, said he had reached the site early yesterday and described "awful" scenes, with several bodies in the carriage.
"We got up to the carriage, although it was very dark there at the time," he said. "The smell was awful."
Hayman said the bombs were believed to have contained up to 4.5kg of explosives and could have been carried onto the trains and bus in backpacks.
Police denied that they had found any unexploded devices. On Thursday, a senior US counterterrorism official who spoke on condition of anonymity because of the sensitivity of the information had said British authorities identified suspicious packages and detonated them in controlled explosions.
Police said they had no specific intelligence warning of the attacks. Home Secretary Charles Clarke said the blasts "came completely out of the blue."
The New York Times reported yesterday that timing devices rather than suicide bombers set off the explosions.
Clarke told BBC radio that investigators were examining a statement from the "Secret Group of al-Qaeda's Jihad in Europe."
The e-mail statement by the previously unknown group said: "Our mujahideen have carried out a blessed invasion in London and here is Britain now burning with fear and terror ... We have repeatedly warned Britain and have kept our promise."



