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Lollapalooza security workers cut short a set by rapper Travi$ Scott after they say he encouraged fans to jump over the security gates.

Several fans did just that and ended up on stage. Scott tried to calm the crowd when he realized security was going to shut down the show, but fans continued to stream on stage.

Scott left Grant Park after the incident and was arrested a short time later by Chicago Police.  He’s charged with disorderly conduct.

Chicago’s Office of Emergency Management released the following statement: “Fans jumped the barricade into the security pit at Lollapalooza during Travis Scott’s performance on Saturday.  The situation was resolved quickly and no patrons were injured.  Operations have resumed as normal.  Chicago Police are handling the matter.”

One fan was also detained in the incident and charged with disorderly conduct.