Islamic State murderer Jihadi John had links to the 2005 bomb plotters who tried to blow up London's tube system just weeks after the horrific July 7 attack which killed 52 people, it has been revealed. Mohammed Emwazi, who was unmasked as Islamic State's cold-blooded executioner last week, was a member of a terror cell that was known to have links to the failed July 21, 2005 attacks on London. Documents have revealed a key figure of his London-based terror cell talked to one of the terrorists on the day of the attempted tube bombing - the would be terrorist was later jailed for life over the failed attack. Scroll down for video . Mohammed Emwazi (pictured) who was revealed as Islamic State's cold-blooded executioner Jihadi John this week, was a member of a terror cell that was known to have links to the failed July 21 attacks on London . The revelation has raised even more questions over how Emwazi, the Islamic State extremist behind the beheading of western hostages, was able to run away from Britain and the scrutiny of the security services despite being a member of the watched terror cell. Emwazi, who was brought up in west London, was subject to a no fly order and was on a terror watch list but still managed to leave without detection. It was revealed this week that he was a 'person of interest' to MI5 as a member of a cell known as The London Boys, which was set up to recruit and raise funds for Somalia-based terror group al Shabab. MI5 was also aware of Emwazi for six years before he appeared on a hostage video for the first time in August 2014. And now, even more worryingly, it has been revealed at least one member of his network had a connection with the worst terrorist atrocity to take place on British soil. The failed July 21 attacks came just two weeks after four men blew themselves up on London's tubes and a bus, killing 52 people and injuring more than 700 in 2005. CCTV footage of failed July 21 bomber Hussein Osman (circled in green) at Clapham Junction train station . Metropolitan Police footage  showing Ismail Abdurahman with Hussein Osman at Vauxhall train station . Court documents seen by The Observer reveal a leading member of Emwazi's network had a phone conversation on the day of the attacks with Hussein Osman, who was later jailed for life for placing an explosive at Shepherd's Bush tube station. The documents show that security services were aware that associates of the 12-strong west London terror group had joined the four July 21 bombers at a training camp in Cumbria a year before the attempted terror attack. On Friday, Boris Johnson lashed out at Home Secretary Theresa May for watering down strict anti-terror powers which may have helped Emwazi escape the net and travel to Syria. The London Mayor accused his Tory leadership rival of giving the 'benefit of the doubt' to terror suspects like Emzawi. Mr Johnson's attack comes amid the growing controversy over who is to blame for MI5's failure to stop 'known wolf' Emwazi leaving Britain for the front line in Syria in 2013. The Government's independent reviewer of terror legislation David Anderson admitted MI5 may have 'slipped up'. But he said: 'One won't know until there's been an inquiry or a report of some kind.' But experts believe Emwazi was helped to escape Britain by his terror associates who had been allowed back to London by the Government in 2011. Mayor of London Boris Johnson (pictured right) lashed out at Home Secretary Theresa May on Friday for 'watering down' strict anti-terror powers which may have helped Emwazi escape the net and travel to Syria . It is understood that three members of Emwazi's network were made subject in 2011 to control orders brought in by the last Labour government, which meant they had to live outside London. But the control orders were disbanded by the coalition and they were instead subject to Tpims – terrorism prevention and investigation measures – which allowed them to return to London and re-engage with Emwazi. Two of the men on these weakened orders – known only as BX and CC in the court documents – aided with money, a false identity and bogus travel documents by the London jihadi cell. The power to relocate terror suspects was reintroduced a fortnight ago, under growing pressure from the security services. Mr Johnson slammed the 2011 'mistake' to scrap the 'internal exile' powers contained in Labour's control order regime. The Mayor of London said: 'We need to keep a very, very close eye on these people. 'The decision to modify the control orders, to water them down I think in retrospect looks as though it was a mistake because it is vital to be able, when you are controlling these people to be able to relocate them, to take them away from their support networks and look after them, to monitor them properly. 'We are now back on the right track and it just confirms to me the vital importance of us being able to monitor these people, to keep tabs on them, to look at what they are saying to each other in their email, their electronic contact. 'This whole thing needs to be tackled very, very robustly. 'We need to have a very strong security response that gives our people, gives our security services and the police the surveillance powers that they need.' British Journalist David Haines (pictured) who was killed by Jihadi John - believed to be Mohammed Emwazi . Labour's shadow home secretary Yvette cooper shadow backed the London Mayor's attack on Mrs May. She said: 'We warned the Government from the start not to abolish control orders. I said in Parliament many times that those relocation powers were immensely important and that removing them would make it easier for terror suspects to organise.' The Labour shadow minister added: 'At the very least, the Prime Minister should ask the Intelligence and Security Committee to examine the period following the scrapping of relocation. 'Parliament needs to know whether the legislation to alter counter terror powers affected the UK's ability to prevent people travelling to Syria. 'The Home Secretary has a duty to protect national security, so if the decisions she made on legislation against expert advice have weakened national security instead, the public and Parliament have a right to know.' A Home Office spokesman said: 'Control orders were not working and were being struck down by the courts. 'Tpims have been endorsed by the courts, counter-terrorism reviewers, the police, and the Security Service. 'Following a review of the powers available to manage the terrorist threat, the range of measures available under the TPIM Act is being extended including a measure to allow Tpim subjects to be relocated to different parts of the country. 'Additionally the Counter-Terrorism and Security Act, which became law this month, will bolster our already considerable armoury of powers to disrupt the ability of people to travel abroad to fight, reduce the risks they pose on their return and combat the underlying ideology that feeds, supports and sanctions terrorism.'
Mohammed Emwazi was revealed as Islamic State's executioner last week .
He had links to the 2005 bomb plotters who tried to blow up the tube .
Failed attack was due to take place just two weeks after 21/7 bombing .
52 people were killed and 700 injured in worst terror attack on British soil .
Court documents reveal key member of Emwazi's watched terror cell spoke to one of the failed terrorists on the day of the attempted bombing .
Revelation raises urgent questions over how Emwazi was able to leave UK .
Islamic State murderer Jihadi John had links to the 2005 bomb plotters who tried to blow up London's tube system just weeks after the horrific July 7 attack which killed 52 people, it has been revealed. Mohammed Emwazi, who was unmasked as Islamic State's cold-blooded executioner last week, was a member of a terror cell that was known to have links to the failed July 21, 2005 attacks on London. Documents have revealed a key figure of his London-based terror cell talked to one of the terrorists on the day of the attempted tube bombing - the would be terrorist was later jailed for life over the failed attack. Scroll down for video . Mohammed Emwazi (pictured) who was revealed as Islamic State's cold-blooded executioner Jihadi John this week, was a member of a terror cell that was known to have links to the failed July 21 attacks on London . The revelation has raised even more questions over how Emwazi, the Islamic State extremist behind the beheading of western hostages, was able to run away from Britain and the scrutiny of the security services despite being a member of the watched terror cell. Emwazi, who was brought up in west London, was subject to a no fly order and was on a terror watch list but still managed to leave without detection. It was revealed this week that he was a 'person of interest' to MI5 as a member of a cell known as The London Boys, which was set up to recruit and raise funds for Somalia-based terror group al Shabab. MI5 was also aware of Emwazi for six years before he appeared on a hostage video for the first time in August 2014. And now, even more worryingly, it has been revealed at least one member of his network had a connection with the worst terrorist atrocity to take place on British soil. The failed July 21 attacks came just two weeks after four men blew themselves up on London's tubes and a bus, killing 52 people and injuring more than 700 in 2005. CCTV footage of failed July 21 bomber Hussein Osman (circled in green) at Clapham Junction train station . Metropolitan Police footage  showing Ismail Abdurahman with Hussein Osman at Vauxhall train station . Court documents seen by The Observer reveal a leading member of Emwazi's network had a phone conversation on the day of the attacks with Hussein Osman, who was later jailed for life for placing an explosive at Shepherd's Bush tube station. The documents show that security services were aware that associates of the 12-strong west London terror group had joined the four July 21 bombers at a training camp in Cumbria a year before the attempted terror attack. On Friday, Boris Johnson lashed out at Home Secretary Theresa May for watering down strict anti-terror powers which may have helped Emwazi escape the net and travel to Syria. The London Mayor accused his Tory leadership rival of giving the 'benefit of the doubt' to terror suspects like Emzawi. Mr Johnson's attack comes amid the growing controversy over who is to blame for MI5's failure to stop 'known wolf' Emwazi leaving Britain for the front line in Syria in 2013. The Government's independent reviewer of terror legislation David Anderson admitted MI5 may have 'slipped up'. But he said: 'One won't know until there's been an inquiry or a report of some kind.' But experts believe Emwazi was helped to escape Britain by his terror associates who had been allowed back to London by the Government in 2011. Mayor of London Boris Johnson (pictured right) lashed out at Home Secretary Theresa May on Friday for 'watering down' strict anti-terror powers which may have helped Emwazi escape the net and travel to Syria . It is understood that three members of Emwazi's network were made subject in 2011 to control orders brought in by the last Labour government, which meant they had to live outside London. But the control orders were disbanded by the coalition and they were instead subject to Tpims – terrorism prevention and investigation measures – which allowed them to return to London and re-engage with Emwazi. Two of the men on these weakened orders – known only as BX and CC in the court documents – aided with money, a false identity and bogus travel documents by the London jihadi cell. The power to relocate terror suspects was reintroduced a fortnight ago, under growing pressure from the security services. Mr Johnson slammed the 2011 'mistake' to scrap the 'internal exile' powers contained in Labour's control order regime. The Mayor of London said: 'We need to keep a very, very close eye on these people. 'The decision to modify the control orders, to water them down I think in retrospect looks as though it was a mistake because it is vital to be able, when you are controlling these people to be able to relocate them, to take them away from their support networks and look after them, to monitor them properly. 'We are now back on the right track and it just confirms to me the vital importance of us being able to monitor these people, to keep tabs on them, to look at what they are saying to each other in their email, their electronic contact. 'This whole thing needs to be tackled very, very robustly. 'We need to have a very strong security response that gives our people, gives our security services and the police the surveillance powers that they need.' British Journalist David Haines (pictured) who was killed by Jihadi John - believed to be Mohammed Emwazi . Labour's shadow home secretary Yvette cooper shadow backed the London Mayor's attack on Mrs May. She said: 'We warned the Government from the start not to abolish control orders. I said in Parliament many times that those relocation powers were immensely important and that removing them would make it easier for terror suspects to organise.' The Labour shadow minister added: 'At the very least, the Prime Minister should ask the Intelligence and Security Committee to examine the period following the scrapping of relocation. 'Parliament needs to know whether the legislation to alter counter terror powers affected the UK's ability to prevent people travelling to Syria. 'The Home Secretary has a duty to protect national security, so if the decisions she made on legislation against expert advice have weakened national security instead, the public and Parliament have a right to know.' A Home Office spokesman said: 'Control orders were not working and were being struck down by the courts. 'Tpims have been endorsed by the courts, counter-terrorism reviewers, the police, and the Security Service. 'Following a review of the powers available to manage the terrorist threat, the range of measures available under the TPIM Act is being extended including a measure to allow Tpim subjects to be relocated to different parts of the country. 'Additionally the Counter-Terrorism and Security Act, which became law this month, will bolster our already considerable armoury of powers to disrupt the ability of people to travel abroad to fight, reduce the risks they pose on their return and combat the underlying ideology that feeds, supports and sanctions terrorism.'
the 2005 bomb plotters who tried to blow up unmasked as Islamic State's cold-blooded executioner last week, was a member of a terror cell talked to one of the terrorists on the day of the attempted tube bombing - the would be Emwazi (pictured) who was revealed as Islamic known to have links to the failed July 21 attacks questions over how Emwazi, the Islamic State being a member of the watched terror cell. take place on British soil. The failed July 21 attacks came just two weeks after four men blew killing 52 people and injuring more than 700 in people to be able to relocate them, to take them