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Chicago Man Faces Federal Charges After Nine-Hour Dirksen Courthouse Standoff

Following treatment for minor injuries, Santoyo awaits a federal court date to face charges that carry up to five years in prison.

FBI agents enter the Dirksen U.S. Courthouse during a standoff between a man with a knife and law enforcement continue on July 22, 2025.  (Terrence Antonio James/Chicago Tribune)
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Overview

  • A federal criminal complaint filed July 25 charges Mario Santoyo with possession of a dangerous weapon in a federal facility with intent to commit a crime, which carries up to five years in prison.
  • Santoyo was released from hospital care after treatment for minor neck wounds sustained during the non-lethal resolution of the nine-hour standoff.
  • The standoff began when Santoyo entered the Dirksen Federal Courthouse armed with a knife, claimed threats from “gangbangers,” and threatened self-harm in the lobby.
  • FBI agents, U.S. Marshals, Department of Homeland Security and Chicago police coordinated floor-by-floor evacuations and used non-lethal force to subdue Santoyo shortly before 8 p.m.
  • The U.S. Marshals Service is probing security lapses that allowed the breach and recent developments have prompted a review of procedures at federal courthouses nationwide.