Five people have appeared before a French judge and could face preliminary charges over a jihadi recruiting network in a small southern town from where several youths went to fight in Syria and Iraq.

Friday's move comes after three days of police questioning of the five after security forces detained them in connection with the network in southern Lunel. Authorities say at least six people from the town died in Iraq and Syria in recent months.

Interior Minister Bernard Cazeneuve has said Tuesday's raids dismantled a jihadi network.

France says about 3,000 citizens have links to extremist fighters in Syria and Iraq, with important contingents in both the Islamic State group and al-Qaida-linked Nusra Front.

Authorities haven't indicated any connection between the suspects and the Paris terror attacks this month.