PARIS - French police arrested four people on Monday suspected of having helped recruit volunteers for radical Islamist networks in Syria, Interior Minister Bernard Cazeneuve said.



European governments increasingly worry that citizens, often from a Muslim immigrant background, going to fight in Syria's civil war will import Islamist militancy upon their return.



Monday's arrests came a day after prosecutors said a 29-year-old Frenchman thought to have returned recently from fighting with Islamist insurgents in Syria had been arrested over the May 24 killing of three people at Brussels' Jewish Museum.



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