Some of the arrests were made in northern France, with two pistols and two machine guns found during one of the raids, a source close to the case said.
The weapons belonged to a man close to one of the suspects, who held the guns legally.
Some of the suspects were in touch on social media or the internet and some of their messages made authorities fear they were planning violent acts, the source added.
The arrests came nearly two weeks after 39-year-old Karim Cheurfi shot and killed a policeman on the Champs Elysees in Paris before being killed by police gunfire.
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