Newsnight's Richard Watson has been following the extremist group al-Muhajiroun for 16 years. In this film, he reveals how the group became a crucible of home-grown terror, from the 7/7 London bombings to the recent London Bridge attacks. His report contains some strong language.
Newsnight is the BBC's flagship news and current affairs TV programme - with analysis, debate, exclusives, and robust interviews.
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