Pentagon goes into shelter-in-place after air-quality alert

TL;DR
Hazardous-material teams are responding to an air-quality issue at the Pentagon, prompting a shelter-in-place for the building. The Defense Department says protective protocols are in place and additional testing could take one to two hours; only essential personnel are allowed inside as response crews work to determine the significance of the issue.
- Hazmat crews respond to ‘hazardous materials incident’ at the Pentagon NBC News
- Hazardous materials incident at Pentagon causes Hazmat, big police response WUSA9
- Pentagon lockdown and evacuation was due to a false alarm, sources say CNN
- Pentagon under shelter-in-place order over ‘air quality issue’ MS NOW
- Pentagon locks down over "hazardous materials incident" Axios
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