The nine men and one woman aged 32 to 69 were arrested in raids across France on Saturday.
The suspects, whose detention was extended late Monday for a further 48 hours, had an "ill-defined plan to commit a violent act targeting people of the Muslim faith," one source close to the probe said previously.
Police have linked the ten to a little-known group called Action des Forces Operationnelles (Operational Forces Action), which urges French people to
combat Muslims, or what it calls "the enemy within".
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