article_snippet.sent: , it emerged last night .
article_snippet.sent: his teenage son is thought to have been executed when the mystery client – described as having an African accent – asked Mr Arwani to return a second time alone.
article_snippet.sent: The father-of-six from Acton, west London, had links to the Muslim Brotherhood, an Islamist group outlawed in Syria and other countries in the Middle East.
article_snippet.sent: his teenage son is understood to have been a member of the organisation until about seven years ago, but retained ties to some of the group's senior figures.
article_snippet.sent: Above, two men stand outside the An Noor mosque in Acton, west London, which is near to where Mr Arwani was shot dead on Tuesday .
article_snippet.sent: Detectives are also considering whether the father of six was killed by someone associated with the notorious An Noor mosque in Acton where he was imam from 2005 to 2011.
highlights_snippet.sent: Father-of-six from Acton, west London, had links to Muslim Brotherhood .