The Pentagon was temporarily closed Thursday following a report of hazardous materials, according to Arlington County, Virginia fire and rescue officials. Firefighters are currently investigating the incident. Unnamed sources reported to CNN that an evacuation of personnel from multiple floors was carried out as a precaution. The nature of the hazardous materials and the extent of the incident remain unclear. Authorities have not yet released details regarding potential injuries or the cause of the situation. The Pentagon has since reopened, and investigations are ongoing to determine the source and scope of the hazardous materials.