The Pentagon, located in Arlington, Va., is on lockdown after a hazardous materials incident was reported. Sean Parnell, the Pentagon’s chief spokesman, released a statement regarding the incident, stating that the building’s sophisticated systems detected an air quality issue, necessitating precautionary measures.

Arlington Fire and EMS confirmed that the department’s Hazardous Materials Team was on scene in support of the incident. The Pentagon, which comprises over 6.5 million square feet and over 17 miles of corridors, is the largest low-rise office building in the world, with over 20,000 people working there.

Part of the Pentagon was struck during the Sept. 11, 2001, terror attacks, killing 189 people. This is a developing story.

Original reporting: KTBS 3 (Shreveport) — read the source article.