Portions of the Pentagon were placed under a partial lockdown and shelter-in-place order Thursday following the detection of an air-quality issue, according to three officials.

Building monitoring systems identified a potential air hazard, leading officials to implement precautionary measures. The Department of Defense is currently working to determine the source and extent of the problem.

Pentagon spokesperson Sean Parnell stated that the building's sophisticated safety systems detected an air quality issue. "Those systems have detected an air quality issue necessitating precautionary measures until we determine its significance," Parnell said in a statement. He added that the Department is executing standard protection protocols, including a shelter-in-place order for the affected area, with response teams on standby.

The Arlington County Fire Department confirmed its hazardous materials team responded to the Pentagon to support the Pentagon Force Protection Agency's Hazmat Team during the incident.

This event triggered a response involving multiple agencies and led to the temporary restriction of movement within affected sections of the building. The focus remains on ensuring the safety of personnel while a thorough investigation into the detected air quality anomaly is conducted.

Officials emphasized that the shelter-in-place order was a precautionary step, designed to mitigate any potential risks associated with the detected air quality issue. The swift activation of response protocols highlights the Pentagon's commitment to maintaining a secure environment for its workforce.

The exact nature of the detected air quality issue has not yet been publicly disclosed. Investigations are ongoing to identify the substance or condition causing the concern and to confirm that all personnel and facilities are safe.

Further updates are expected as the situation develops and more information becomes available from the investigating teams.