Civilians also have been exposed inadvertently to chemical weapons many years after weapon deployment during war. Some 50,000 tons of mustard shells were disposed of in the Baltic Sea following World War I. Since then, numerous fishermen have been burned accidentally while hauling leaking shells aboard boats. Leaking mustard shells also have injured collectors of military memorabilia and children playing on old battlefields.
http://www.emedicinehealth.com/chemical_warfare/article_em.htm
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