Teenager held in Turkey while trying to flee to ISIS had 'extremist views ' 17-year-old was stopped with cousin , 17 , and 19-year-old man on Saturday . One of the teens apparently previously made jibes at murder of Lee Rigby . Also spoke of 'not being able to recognise ' himself compared to a year ago . sixth form student was arrested on suspicion of preparing acts of terrorism . CCTV footage shows trio being stopped by immigration at Istanbul airport .
Teenager held in Turkey while trying to flee to ISIS had 'extremist views ' 17-year-old was stopped with cousin , 17 , and 19-year-old man on Saturday . One of the teens apparently previously made jibes at murder of Lee Rigby . Also spoke of 'not being able to recognise ' himself compared to a year ago . Sixth form student was arrested on suspicion of preparing acts of terrorism . CCTV footage shows trio being stopped by immigration at Istanbul airport .