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The BBC has uncovered new evidence about the teenage killer of Bibaa Henry and Nicole Smallman, the two sisters murdered last summer in a Wembley park in London.
Danyal Hussein was a member of a web forum, run by an American self-styled black magician, whose instructions about demonic pacts mirror steps taken by the killer.
The American has encouraged murder in some of his writings, including for a violent Satanic group that’s been cited as an influence on seven young men convicted of neo-Nazi terror offences in the UK over the past two years.
The BBC’s Daniel De Simone has been investigating the background.
Video journalist: Alex Dackevych