Teenager stopped from joining from joining IS after plane held at Heathrow . 15-year-old went to same school as three who fled to Syria 2012 . They and other girl all attended Bethnal Green Academy in east London . Total of eight from the academy shown to have had interest in extremism .
Teenager stopped from joining from joining IS after plane held at Heathrow . 15-year-old went to same school as three who fled to Syria last month . They and other girl all attended Bethnal Green Academy in east London . Total of eight from the academy shown to have had interest in extremism .