article_snippet: The leader of the group, who came to be known as Jihadi John and has since been identified as Kuwaiti-born Londoner Mohammed Emwazi, went on to behead five hostages.
article_snippet: The leader of the so-called 'Beatles' - who came to be known as Jihadi John (left) and has since been identified as Kuwaiti-born Londoner Mohammed Emwazi (right) -  went on to behead five hostages .
article_snippet: : American journalist James Foley was the first Western citizen to have been killed on film by Jihadi John in a sickening propaganda video .
article_snippet: Britons Alan Henning (left) and David Haines (right) are among the hostages who were savagely murdered by Jihadi John .
article_snippet: Sick: James Foley (left) became the first Westerner to be murdered by the terror group's British executioner in chief Mohammed Emwazi, also known as 'Jihadi John', (right) in a shocking filmed beheading last August .
article_snippet: Alongside American journalists and aid workers including Britons Alan Henning and David Haines, they were locked in ISIS prisons - as Javier Espinosa describes they as 'elegant mansions' and the former government headquarters in Raqqa - across the war-ravaged country for months.
highlights_snippet: Jihadi John - later identified as Mohammed Emwazi - was the gang leader .
  