In May 2018, tensions built up between members of Arab tribes, most notably the SDF group Liwa Thuwar al-Raqqa, and the rest of the alliance and the RISF over recruitment issues in Raqqa. A curfew was put in place in both Raqqa city and the rest of the governorate on 23 June, as the SDF and RISF besieged Thuwar al-Raqqa's headquarters and arrested between 90[19] and 200 of its members the next day.[20] By 25 June, the SDF and RISF had captured all of Thuwar al-Raqqa fighters and their weapons in Raqqa, completely defeating the group, and the curfew was ended.[21]