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The Army says it has reached a milestone at a Colorado chemical weapons depot by destroying nearly 300,000 decades-old artillery shells containing mustard agent.

An Army depot in Pueblo has long been home to a toxic legacy: hundreds of thousands of chemical weapons. They've been stockpiled there for generations, and they must be destroyed according to an international treaty. Environmental concerns have delayed the effort, but now, the weapons are finally disappearing.

A Colorado plant destroying obsolete U.S. Army chemical weapons has taken a step toward resuming full operations.Officials said Monday the Pueblo Chemical…

The U.S. Army resumed destroying obsolete chemical weapons at a Colorado depot after a nine-month shutdown for repairs, officials said Wednesday.The…