A potential hazardous material incident triggered an alarm and partial evacuation at the Pentagon. Internal sources report that several areas of the building have been isolated as a precautionary measure. Evacuation procedures are currently underway in additional sections of the complex. The nature of the hazardous material remains unconfirmed at this time, and investigations are ongoing. Emergency services are on the scene, assessing the situation and working to ensure the safety of personnel. Further details are expected to be released as the investigation progresses and more information becomes available. No injuries have been reported thus far.