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 ...

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

The Dirksen Federal Building in downtown Chicago is on lockdown, the FBI said. Mother-of-three found dead in lake was ...

The Dirksen Federal Building in Chicago was locked down after reports of a knife-wielding person inside. FBI is investigating ...

The Dirksen Federal Building in downtown Chicago was on lockdown Tuesday morning, according to the Federal Bureau of ...

Following a nine-hour standoff at the Dirksen Federal Building, a knife-wielding man — who prompted a lockdown and evacuation at the courthouse — was disarmed by tactical officers and taken by ...

The Dirksen Federal Building and its surrounding streets are back open Wednesday morning after a knife-wielding man entered ...

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 ...

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