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PUEBLO, Colo.—Army officials say mustard agent vapor has been detected in a storage igloo at the Pueblo Chemical Depot, indicating one or more artillery shells is leaking.
The vapor was discovered Tuesday during routine monitoring. Officials say a second filtering system has been placed on the igloo, and workers will begin searching for the source on Wednesday.
Such searches can take weeks or months because each bunker can contain thousands of shells.
The depot contains 2,600 tons of mustard agent awaiting destruction under an international treaty. A plant to neutralize the agent is under construction on the depot grounds. It’s expected to begin work in 2015.
