Several floors of the Pentagon were closed and some areas evacuated on June 11, 2026, due to a reported hazardous material incident. Authorities, including the Arlington Fire Department and Pentagon police, responded to the situation. First responders on site were observed wearing gas masks and full protective chemical gear. The nature of the hazardous material has not yet been disclosed. The evacuation impacted multiple floors of the building, disrupting normal operations. An investigation is underway to determine the cause and scope of the incident, with further details expected to be released as they become available. No injuries have been reported at this time.