WWI chemical weapons cache found in D.C. yard

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A year ago, the U.S. Army Corps of Engineers thought chances of finding any more chemical weapons in the front yard of a home in the nation's capital were slim. So they removed an airtight protective structure from the World War I munitions cleanup site. Then, they uncovered a small arsenal.

The Corps discovered an open flask containing traces of the chemical agent mustard, another blistering agent called lewisite and munition shells with more digging near a one-time Army chemical warfare station at American University.

More recently, protective structures were rebuilt and digging continued. Workers found a larger jar with mustard, glassware that was smoking and fuming, scrap munitions and a shell containing a tear gas agent.

The Army Corps has removed more than 500 pounds of glassware and scrap metal and nearly 750 barrels of soil, some of it contaminated with chemical agents, said spokeswoman Joyce Conant....

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