France has seized the passports of six citizens who were planning on traveling to Syria and Iraq to join Daesh, AFP reported.
Forty more will be banned from leaving France, AFP said.
"If French people go commit attacks in Iraq or in Syria, on their return they will present an even greater danger of carrying out large-scale terrorist attacks on the national territory," Interior Minister Bernard Cazeneuve told AFP.
France is just one of several European countries that have been cracking down on "would-be jihadists" who have shown plans to fight in the Syrian conflict. The EU's counterterrorism Gilles de Kerchove called for more information sharing and screening among travelers in the continent.