Mr. Butt appeared briefly in a Channel 4 television documentary last year about extremists living in Britain. The film, which is also available on Netflix, featured a number of British Muslim men openly expressing their support for violence.
.. “He invited me and everyone to a barbecue in the block’s shared garden green area a week ago,” Mr. Chigbo recalled. “He’s a neighbor. I trusted him, we got on.”
.. Mr. Chigbo said small groups of three or four “Muslim guys” used to regularly visit Mr. Butt’s apartment. “I found them quite intimidating, actually,” he said. “They were always in religious robes and wearing red and white checkered scarves wrapped around their heads.”