The Pentagon was partially evacuated on Tuesday following reports of a suspicious substance, CNN reported. Multiple floors and corridors within the building were closed as a precautionary measure while authorities investigated. The nature of the substance remains unknown at this time, but officials are treating the situation with caution. Initial reports suggest the evacuation was prompted by concerns over a potentially dangerous material. Emergency services responded to the scene, and a thorough assessment of the affected areas is underway. No injuries have been reported as of yet, and the investigation is ongoing to determine the source and composition of the substance. The Pentagon has not released further details regarding the incident.