More than 300 people have left Sweden to fight for ISIS in Syria and Iraq, one of the highest numbers in Europe, per head of population. Many are second generation immigrants and come from neighbourhoods on the fringes of Sweden's two largest cities, Stockholm and Gothenburg. Yalda Hakim has been to one such community in Gothenburg to discover why so many young people there are attracted by ISIS. She meets a young man who describes how extremists tried to recruit him and she talks to a young girl who has returned from Isis-controlled Syria. Gothenburg police tell her they have a problem and admit they are struggling to cope.