A Chicago man is charged with pulling a knife in the lobby of the Dirksen U.S. Courthouse, leading to a 9-hour standoff.

An FBI affidavit alleges that Mario Santoyo, 38, refused to follow law enforcement's commands when told to put down a knife ...

Following a nearly nine-hour lockdown for a man armed with a knife at one of the most secure federal facilities in Chicago, the ABC7 I-Team spoke with federal law enforcement experts about the process ...

CHICAGO (WLS) -- A standoff at the Dirksen Federal Building downtown Chicago ended after roughly nine hours Tuesday night.

Partnerships between police agencies are what DePodesta thinks is behind the 30% drop in homicides in Chicago and the 40% ...

Experts are praising efforts of officers to bring the Tuesday barricade situation at the Dirksen Federal Building to an end ...

Chicago’s Dirksen Federal Courthouse was placed on lockdown Tuesday morning after reports of a knife-wielding person inside ...

CBS News Chicago witnessed the man being tackled by law enforcement and removed from the courthouse lobby on a stretcher.

The FBI and other law enforcement personnel responded to a man in the Dirksen lobby who walked into the courthouse armed with ...

The building was placed on lockdown shortly after 11 a.m., the FBI confirmed. The U.S. Marshals said a man armed with a knife ...

The Dirksen U.S. Courthouse and other federal buildings were placed on lockdown Tuesday midday as law enforcement personnel ...