German police said Friday that they have arrested a 20-year-old Algerian woman on suspicion of serving in ISIS extremist group. Federal prosecutors said the German-Algerian woman, identified as Sarah O. for privacy reasons, is accused of membership in a foreign terrorist organization. Prosecutors said she traveled to Syria as a teenager in October 2013, where she received firearms training and married an ISIS militant from Germany in 2014. She and her husband conducted "guard and police duties" in ISIS-controlled areas, German authorities said. She is also alleged to have tried to recruit others in Europe to join the terrorist group and, together with her husband, received about $118 a month from ISIS. Prosecutors spokeswoman Frauke Koehler said the womans children were taken into care upon their arrival at Duesseldorf airport from Turkey on Friday.