A portion of the Pentagon was evacuated Tuesday following the detection of a hazardous substance. Multiple floors and corridors were closed as a precautionary measure while authorities investigated the source and nature of the material. Emergency responders were dispatched to the scene and are currently working to assess the situation and mitigate any potential risks. The evacuation affected personnel in the impacted areas, with no immediate reports of injuries. The Pentagon Protective Service is leading the investigation, and further details are expected to be released as they become available. Normal operations have been disrupted, but officials aim to restore full access as quickly and safely as possible. The nature of the hazardous material remains undisclosed at this time.