Pentagon locked down as hazmat crews investigate building: officials

The Pentagon, one of the world's largest office buildings, experienced a lockdown on Thursday as emergency responders investigated a hazardous materials incident. Arlington County fire and rescue officials confirmed their units, including the Hazardous Materials Team, were operating at the facility to support the Pentagon Force Protection Agency's Hazmat Team.

Reports indicated that the building was partially evacuated, with people removed from several floors. Emergency responders were observed wearing full gas masks and chemical protection suits, suggesting the potential seriousness of the detected substance. CNN cited unidentified sources reporting that floors two through five, along with some corridors, were locked down.

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The Pentagon has sophisticated systems to ensure the safety of the building and its occupants. Those systems have detected an air quality issue necessitating precautionary measures until we determine its significance.

Pentagon spokesman Sean Parnell addressed the situation via email, stating, "The Pentagon has sophisticated systems to ensure the safety of the building and its occupants. Those systems have detected an air quality issue necessitating precautionary measures until we determine its significance." He added that standard protection protocols were being executed, including a shelter-in-place order for the affected area.

The incident occurred on June 11, 2026, and emergency services were actively working to determine the nature and significance of the air quality issue. The Pentagon, which was famously attacked on September 11, 2001, has robust safety and security systems in place to manage such events.

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The Department is executing standard protection protocols, including a shelter-in-place order for the affected area. Response teams are in place and ready to support building occupants.