Anti-war protesters march in London on eve of Syria strikes vote
The men, all in their 30s, were taken into custody at a London police station. Searches were being conducted at seven addresses in Luton, north of London, and several vehicles were also being searched, police said.
The arrests and searches were part of an ongoing investigation of individuals in the Luton area and were not connected to the November 13 Islamic State attacks in Paris, the statement said.
Islamic State's online supporters include 300 Americans: report
The government has said seven plots to attack targets in Britain, directed or inspired by Islamic State, have been thwarted by security services in the past year.
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