A hazardous materials incident prompted a partial shutdown of the Pentagon on Tuesday, according to defense officials. Spokesman Sean Parnell reported that the Pentagon’s systems detected an air quality issue, triggering precautionary measures. While the nature of the hazardous material was not immediately disclosed, the building was briefly evacuated as a safety precaution. Emergency responders investigated the situation and worked to identify the source of the air quality concern. Normal operations have resumed after the all-clear was given, though investigations are ongoing to determine the cause of the incident. No injuries have been reported at this time.