egyptian-born hani al-sibai is believed to have influenced a number of young men , who then travelled abroad to join terror groups , including jihadi john , whose real name is mohammed emwazi that the radical cleric lives in the same neighbourbood where emwazi , who was unmasked in february as the notorious murderer in islamic state 's ruthless propaganda videos , hung out with fellow jihadists .
now , security services are believed to be investigating al-sibai 's influence on london boys terror cell of which enwazi was a part .