This was because the "fourth" bomber was wrongly identified in the United States as Lindsay Jermaine - someone with a similar name to a terrorist suspect.Scotland Yard is concentrating on establishing the movements of the four bombers from Leeds and Aylesbury, and what explosives they used.Sniffer dogs are being used on the Tube to detect explosives. Dozens of dogs will be deployed throughout the London Underground system and the police may also introduce random checks using metal and bomb detectors on the Underground.* Police have until Saturday to continue questioning a 29-year-old man arrested in West Yorkshire last week in connection with the bombings. He is the only person to have been arrested so far in Britain over the attacks.. Mainstream Muslim leaders will inform Charles Clarke, the Home Secretary, today of the measures they intend to take to tackle extremism in their communities. A group of 25 leaders declared their determination to confront violent and reactionary believers in their midst after a meeting yesterday with Tony Blair at Downing Street. They agreed to set up a task force that would explore the extent of disaffection among the Muslim population.Sir Iqbal Sacranie, secretary general of the Muslim Council of Britain, said the No 10 meeting - attended by the Conservative leader, Michael Howard, and the Liberal Democrat leader, Charles Kennedy - had been "an important listening exercise".

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The Labour MP Shahid Malik, whose Dewsbury constituency was home to one of the bombers, indicated there was a desire to take on the "profound challenge" of rooting out extremism "I think everyone here is up for the challenge," he said. "We have to work better at confronting these evil voices - minute as they are in our community."Mr Blair said the meeting had shown there was a "very strong desire" to "confront, and deal with head on, the extremism that is based on a perversion of the true faith of Islam".But radical Muslim clerics condemned the Government and criticised Mr Blair's foreign policy.

Sheikh Omar Bakri Mohammed told the London Evening Standard: "The British people did not make enough effort to stop its own government committing its own atrocities in Iraq and Afghanistan. They showed Tony Blair full support when they elected him Prime Minister again even after he waged the latest war against Iraq."Anjem Choudary, UK leader of the militant Islamist group al-Muhajiroun, accused Mr Blair of having "blood on his hands" and operating an "atrocious foreign policy". In an interview on Radio 4's Today programme, he declined to condemn the 7 July bombings and warned there was a "very real possibility" of a repeat of the atrocities.Their comments came as it emerged that Scotland Yard has tried unsuccessfully to prosecute seven extremist Islamic preachers in the past four years for praising or encouraging terrorism.Sir Ian Blair, Commissioner of the Metropolitan Police, said the current law meant it was extremely difficult to punish what he called "the preachers of hate".He said his officers had tried on more than 20 occasions since 2001 to bring extremists to court, but had only succeeded once. In March 2003, Abdullah el-Faisal, a Muslim cleric who urged his followers to join a jihad or holy war and kill unbelievers, was jailed at the Old Bailey for nine years.Sir Ian, Britain's senior police chief, gave his backing to the Home Office's proposal for a new law to make it a crime to glorify or condone terrorism. He said the current threshhold at which it was possible to prosecute someone for incitement to murder was "very high".Instead, he said an offence of "glorifying" acts of terrorism would make it much easier to crack down on those who espoused extremist views "What do we do about the preachers of hate?" he asked. "On 20 occasions in the last couple of years we have put different pieces of evidence to the CPS - sometimes about the same people. Only once have we been able to cross the boundary of incitement to murder.

There is no criticism of the CPS - that is just the law."He continued: "You cannot commit a criminal offence that does not exist. The painful process of announcing the death toll from the London bombings is expected to draw to a close today when police name the last three victims. Scotland Yard confirmed yesterday that Anna Brandt, Richard Gray, Ihab Slimane and Lee Harris were among the 56 dead - a total that includes the four bombers. Inquests were opened on Mr Slimane, Mr Gray and Elizabeth Daplyn, 26, an administrator from north London. The last 11 inquests are due to be opened and adjourned at St Pancras coroner's court today, revealing the identity of the final three known victims.Police confirmed that Ms Brandt, a 41-year-old Polish cleaner of Wood Green, died on the Piccadilly line. Her brother, Pawel Iskrzynski, said: "We have lost our dearest Anna...