Protesters blocked several roads.
The seven people are expected to appear in the Bloemfontein Magistrate s Court soon.
A teenage boy was shot dead during violent protests in Mangaung on Monday morning, Free State police said.
Police spokesperson Brigadier Motantsi Makhele said it was alleged that the incident happened when a group of protesters attacked a warehouse in Dr Belcher Road, Bloemfontein.
A 57-year-old security guard has been arrested for the teen s murder. The security guard, who was alone at the time, fired a shot in a quest to scare the mob but unfortunately hit a 15-year-old boy, Makhele said. The teenager died on the scene.