"The Pentagon Metrorail station is currently closed while an investigation is being conducted into a possible 'hazmat' situation," the Washington Metropolitan Area Transit Authority said in a brief statement.

Pentagon spokeswoman Cheryl Irwin said a hazardous materials response unit was dispatched to inspect the evacuated station, which serves the US military headquarters here.

Irwin said the action was taken after several people in the station reported experiencing eye and throat irritation.

"As a precaution, the Pentagon closed the metro entrance," she said.

Train service was suspended to the station, which is used by thousands of Pentagon officials and employees daily.

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