Nazir Afzal said schools were worried about pupils travelling over holidays . But schools protecting teenagers because they do not want them placed under investigation , he claims . About 600 Britons are believed to have joined northwest England since 2013 .
Nazir Afzal said schools were worried about pupils travelling over holidays . But schools protecting teenagers because they do not want them placed under investigation , he claims . About 600 Britons are believed to have joined Islamic State since 2013 .