Pentagon workers evacuated as officials investigate possible hazardous exposure

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Firefighters are investigating a hazardous materials incident at the Pentagon, with the building under lockdown and evacuations occurring.

A general view of the Pentagon in Washington, D.C., February 28, 2026. REUTERS/Nathan Howard/File Photo

A hazardous materials incident prompted a lockdown at The Pentagon on Thursday, as fire and emergency personnel investigated an air quality concern, according to defense and fire officials, Reuters reported.

Firefighters were responding to a suspected hazardous materials incident at the Pentagon on Thursday, according to officials from the Arlington County Fire Department, who announced the situation in a post on X.

According to a report by CNN, citing unnamed sources, the building was placed under lockdown, and occupants were evacuated from multiple floors. The report also stated that emergency personnel were operating in full protective gear, including gas masks and chemical-resistant suits.

"The Pentagon has sophisticated systems to ensure the safety of the building and its occupants. Those systems have detected an air quality issue necessitating precautionary measures until we determine its significance," Pentagon spokesman Sean Parnell said in an email, as reported by Reuters.

“The Department is executing standard protection protocols, including a shelter-in-place order for the affected area. Response teams are in place and ready to support building occupants.”

A notification issued by the security team at The Pentagon stated that an “air quality issue” had been identified within the building and that further testing was required to determine the cause and assess any potential risks, CNN reported.

“This additional testing could take one to two hours. Response teams are in place and ready to support building occupants if necessary. You may observe response personnel from multiple agencies and precautionary measures taking place in the center courtyard. Please do not interpret these activities,” the message said.

(With inputs from Reuters)

(This is a developing story; check back later for updates)

About the Author

Mausam Jha

Mausam Jha is a journalist who focuses on world affairs and politics. She provides clear, informative reporting with a good understanding of both global events and their local impact. Her clear, accessible reporting on political and international issues makes her a trusted source of news and analysis. For the past three years, Mausam has worked with Mint, covering national politics, IR—including elections—and global affairs. Before joining her current role, she gained experience working with The Statesman, ANI, and Financial Express, where she honed her skills in political and international news. She has consistently tracked key electoral battles, including US elections, Japan elections, policy debates, and strategic affairs, explaining how global currents, from great power competition to regional conflicts Beyond journalism, Mausam has a deep engagement with international relations, diplomacy, war studies, terrorism, political history, and political theory. She is particularly interested in the intersection of statecraft and society on how governance, ideology, and institutions shape lived realities, and how politics shape today's world order. An avid reader of classical literature and political thought, she constantly explores the connections between historical ideas and contemporary policy challenges.

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