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US urges citizens to avoid travel to French Guiana after protests
Two charged with supplying arms to French airport attacker
French Interior Minister Manuel Valls
Three French-Congolese and a Malian were arrested on Tuesday in the Paris region as part of an investigation into a network set up to send jihadists to fight in west Africa, police said.
Police provided no further information about the arrests but Interior Minister Manuel Valls said they were linked to the capture of an individual on the Mali-Niger border several months ago.
The probe is being conducted by French intelligence agents, a police source said, adding that several dozen French nationals had travelled to Syria to fight in the conflict there, sometimes in groups linked to Al-Qaeda.
There are also people who want to go to west Africa, he said, remarking that a "handful" of French would-be jihadists are probably already in Mali.
Dossier: War in Mali
The French intervention which began on January 11 has halted the advance on the capital Bamako by Islamists who seized a swathe of the north in 2012.
With the Malian army, the French have taken back large chunks of territory from the militant groups, but concerns remain that the fighters have simply gone underground.