Multiple Pentagon floors have been locked down over an incident involving "hazardous materials," according to different reports.
Pentagon spokesman Sean Parnell said Pentagon systems "detected an air quality issue necessitating precautionary measures until we determine its significance."
"The Department is executing standard protection protocols, including a shelter-in-place order for the affected area," the official added. "Response teams are in place and ready to support building occupants."
CNN noted that the Pentagon Force Protection Agency's hazardous materials response team is responding to the incident along with the Arlington County Fire Department. Police officers in the building are wearing gas masks and full chemical protective gear, the outlet added.
The Pentagon's security team said "additional testing could take one to two hours," with response teams in place and "ready to support building occupants if necessary."
"You may observe response personnel from multiple agencies and precautionary measures taking place in the center courtyard. Please do not interpret these activities," the message added.
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