The Pentagon was locked down and partially evacuated on June 11, 2026, after a malfunctioning sensor triggered a false alarm for anthrax. Officials described the event as an "air quality issue" and issued a shelter-in-place order for several floors. Emergency crews, including hazmat teams in full protective gear, responded to the scene before the incident was confirmed to be a false alarm.
Pentagon lockdown procedures
- ▪The Pentagon was locked down and partially evacuated on June 11, 2026, following a hazardous materials incident
- ▪A shelter-in-place order was issued for the affected area as part of standard protection protocols
Air quality false alarm
- ▪A Pentagon sensor system initially detected the possible presence of anthrax, triggering the alarm
- ▪Pentagon spokesman Sean Parnell stated that the building's systems had detected an "air quality issue."
- ▪The lockdown was caused by a false alarm from a malfunctioning hazardous materials sensor
Affected corridors and floors
- ▪The affected area includes the Navy's main public affairs office and the Secretary of the Army's office
- ▪Floors two through five in corridors four through seven of the Pentagon complex were locked down
- ▪The Pentagon is one of the world's largest office buildings, employing nearly 30,000 military and civilian personnel
- ▪The Pentagon building was a target during the September 11, 2001 al Qaeda attacks
Emergency response teams deployed
- ▪Emergency responders and police in the building were seen wearing gas masks and full chemical protective gear
- ▪The Arlington County Fire Department and its Hazardous Materials Team were deployed to assist the Pentagon's response team
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