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.



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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.