Pentagon lockdown after air-quality alert triggers hazmat response

TL;DR
Several floors of the Pentagon were placed on lockdown after an air-quality issue prompted hazmat teams to respond; staff were ordered to shelter in place in corridors 2–5 and to move in-person meetings online while authorities assess the situation.
- Multiple Pentagon floors on lockdown due to 'hazardous materials' BBC
- 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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Read on BBC