Counter terrorism officers have arrested a 64-year-old man from Edgware on suspicion of money laundering.
The man has been taken into custody at a central London police station, while officers search the address in Brook Avenue.
The arrest is part of an ongoing investigation into money laundering.
Five other men previously arrested in connection with the investigation remain on police bail until later this month.
They include two men, aged 73 and 44, who were arrested in December 2013 and a 61-year-old arrested last June.
A 41-year-old man was also arrested in January in Greater Manchester, and a 27-year-old man was arrested in February in Suffolk.
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