The Pentagon was partially locked down Thursday morning after emergency crews rushed to the sprawling Defense Department headquarters in response to what officials described as a hazardous materials incident.
The Arlington County Fire Department said its crews, including a specialized hazardous materials unit, were assisting the Pentagon Force Protection Agency’s Hazmat Team as they worked inside the building.
Pentagon spokesman Sean Parnell confirmed that authorities were responding after monitoring systems flagged a potential air quality problem, saying, “sophisticated systems” had “detected an air quality issue necessitating precautionary measures until we determine its significance.”
As a result, officials imposed protective measures while investigators worked to determine the cause of the alert.
“The Department is executing standard protection protocols, including a shelter-in-place order for the affected area,” Parnell added, referring to the Defense Department. “Response teams are in place and ready to support building occupants.”
The shelter-in-place order affected portions of the Pentagon while emergency personnel continued evaluating the situation.
In a post on X, the Arlington County Fire Department said emergency units, including its hazardous materials team, were “operating at the Pentagon in support of PFPA’s Hazmat Team during a hazardous materials incident.”
Authorities have not disclosed what substance, if any, triggered the response, and no injuries were immediately reported.
The Pentagon, which serves as the headquarters for the Department of Defense and houses thousands of military and civilian employees, remained under heightened precautions as crews investigated the air quality issue.
Officials stressed that the response followed established safety protocols and said specialized teams were standing by to assist anyone inside the affected area.
The incident prompted a flurry of activity around the building Thursday morning as first responders converged on the complex and authorities worked to determine whether the alert posed any danger to personnel.
Additional details about the cause of the incident were not immediately available.
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