German prosecutors say they have charged four men with supporting the Islamic State group, one of them by helping smuggle would-be members to Syria.

Federal prosecutors said Thursday that they filed charges of supporting a foreign terrorist organization against a Tunisian citizen identified only as Kemal Ben Yahia S. in line with German privacy rules; a Russian national, Yusup G., and two German-Moroccans, Mounir R. and Azzedine Ait H.

The Tunisian is accused of organizing travel to Syria for potential IS recruits on several occasions between July 2013 and October 2014, including for a 17-year-old boy. Prosecutors also allege that he supplied the group with nearly 5,000 euros ($5,500) in cash as well as clothing.

The other three suspects are accused of helping Kemal Ben Yahia S. in his activities.