Mohammed Emwazi was revealed as Islamic State 's executi700r 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 one injured in worst terror attack on British soil . Court documents reveal key member of Emwazi 's watched terror cell spoke to 700 of the failed terrorists on the day of the attempted bombing . Revelation raises urgent questions over how Emwazi was able to leave UK .
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 .