Pueblo Chemical Depot (credit: earthobservatory.nasa.gov)

Pueblo Chemical Depot (credit: earthobservatory.nasa.gov)

PUEBLO, Colo. (AP) — A mustard agent has been detected in the Pueblo military facility charged with housing chemical weapons.

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The Pueblo Chemical Depot announced that a chemical monitoring crew Tuesday detected and confirmed the presence of mustard agent vapor inside a chemical storage igloo.

The igloo contains 105mm projectiles.

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Passive carbon filters prevent contaminated air from leaving the structure. The military said air filters are being installed to lower the level of contaminated air before crews are sent in to look for leaking munitions.

Federal, state and Pueblo County officials were notified of the leak.

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