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. Last Updated: 07/27/2016

London Police Search for Clues

LONDON -- Commuters returned to work in London on Monday, at the start of the first full week since bombers killed at least 52 people on a bus and subway trains. Many travelers said they would defy the attackers by using public transportation as normal, but some were too afraid and took taxis instead.

"I ... will not let the attacks put me off," said computer consultant Paul Williams, 42, as he prepared to board an Underground train in central London. "As far as I am concerned, it is just a normal day at work."

The British Transport Police have said London transportation is open for business this week, and that commuters should return to work and businesses reopen in defiance of the terrorists.

Mayor Ken Livingstone took the subway to work Monday to send the message that Londoners should "carry on." "We are going to work. We carry on our lives," he said. "We don't let a small group of terrorists change the way we live."

Police said the number of people confirmed dead in the London bombings rose Monday to 52 from 49. On Thursday, another 700 were injured, 60 of whom remained in hospitals.

For investigators, Monday was another pressure-packed day of sifting through subterranean debris, checking tips from the public and identifying the dead and missing. Workers were still pulling corpses from a subway train.

Scotland Yard said Monday it had identified the first of the victims -- Susan Levy, 53, of Hertfordshire outside London. Forensics experts have warned that it could take days or weeks to put names to the bodies, many of which were mangled in the blasts.

Transit officials said the number of passengers using the system Monday morning was back to normal.However, a few sections of the underground rail system affected by the attacks remained closed Monday, and the number of shoppers in central London has fallen by about 25 percent since the attacks, British media reported.

Police appealed to the public to e-mail any photos, videos or images from camera-equipped mobile phones they took in the vicinity of the four blasts. Other officers sought leads by examining surveillance camera footage or checking out tips -- 1,700 at latest count -- flooding in from the public.

Brian Paddick, deputy assistant commissioner of Metropolitan Police, appealed for videos, photos and cell phone images taken close to the time and the scene of the explosions that might provide clues to the terrorists' identities. If in doubt, police told the public, "please let us decide if the images you have are important."

Police also said three men -- all Britons --arriving at Heathrow airport were arrested early Sunday, but immediately dismissed speculation of their having a break in the investigation. The three were released late Sunday night.

Security officials in Poland said Monday that they searched the home of a British citizen of Pakistani origin in the eastern city of Lublin in connection with the bombings. Poland's Internal Security Agency did not release the man's name.