Authorities respond to 'hazardous materials incident' at Pentagon, fire officials say

The chief Pentagon spokesman said "normal operations have resumed."

A partial lockdown at the Pentagon implemented in response to a potential air quality issue has been lifted after no hazards were found, according to the Pentagon's chief spokesman.

Portions of the Pentagon had gone into a shelter-in-place earlier Thursday, after officials locked down multiple floors and hallways in response to a potential air hazard situation, according to three officials.

Chief Pentagon spokesman Sean Parnell said in a statement earlier that building monitoring systems detected an air-quality issue, prompting precautionary measures while officials work to determine the source and extent of the problem.

In an update Thursday, Parnell said subsequent testing "confirmed no hazard exists, and normal operations have resumed."

Sources told ABC News earlier that authorities were investigating what caused a sensor to alert for a potential hazardous air quality issue at the Pentagon. Additional testing occurred to verify whether there was any hazard or if the sensor was faulty, multiple sources said.

In a message sent to Pentagon employees earlier Thursday, employees in certain corridors on select floors were urged to remain in place while awaiting testing results, which it noted could take one to two hours.

The Arlington County Fire Department said its hazardous materials team had responded to the Pentagon in support of the Pentagon Force Protection Agency's Hazmat Team "during a hazardous materials incident."

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