False alarm apparently triggered hazmat response at Pentagon, sources say

Hazmat crews deployed to the Pentagon on Thursday and a shelter-in-place was in effect for what authorities described as a “hazardous materials incident.”

In a social media post, the Arlington County Fire Department said emergency units, including its hazardous materials team, were “operating at the Pentagon in support of PFPA’s Hazmat Team during a hazardous materials incident.”

Pentagon spokesman Sean Parnell confirmed that a shelter-in-place was in effect for affected areas.

“The Pentagon has sophisticated systems to ensure the safety of the building and its occupants,” Parnell said. “Those systems have detected an air quality issue necessitating precautionary measures until we determine its significance.”

This is a developing story and will be updated.