Anti-extremism proposals announced by the British government on Wednesday are widely seen as targeting individuals like radical Islamist preacher Anjem Choudary, who is seen as an influential figure in the UK. Research from the US, as well as an investigation by the BBC, suggests his influence also extends across Europe.

Torill Karlsen walks through the park in a quiet Norwegian town where she used to take her son, Thomas Alexander.

It was just over a month ago that she received a phone call telling her that he had died - killed while fighting for the group calling itself Islamic State, in Kobane, Syria.

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