A man from north west London has been arrested this morning by officers from the Counter Terrorism Command.
The 64-year-old is being questioned by detectives at a police station in central London while officers search his home.
He is being held in connection with an investigation which has also resulted in the arrest of five men aged 27, 41, 44, 61 and 73 between December 2013 and February 17 this year.
All five have been bailed.
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