About 150 supporters of a man arrested by anti-terror police have staged a march and protest over his detention.
Abu Izzadeen (left) heckled the home secretary
Officers raided Rajib Khan's home in Vestray Close, Luton, on Tuesday.
Scotland Yard confirmed Mr Khan, 28, and five other men were suspected of incitement to commit terrorism overseas and terrorist fund-raising.
People from Regent's Park mosque joined the supporters after Friday prayers and they marched to Paddington Green police station in London to stage a protest.
Those held include Abu Izzadeen, also known as Omar Brooks, who made headlines when he heckled Home Secretary John Reid at an event last year.
The other men arrested are a 24-year-old, 35-year-old and 21-year-old, all from east London, and a 27-year-old from Southall in the west of the capital.
The BBC understands that the arrests are connected to an alleged incident at a mosque in 2004.