CBS – Four Americans taken hostage by Somali pirates off East Africa were shot and killed by their captors Monday, the U.S. military said, marking the first time U.S. citizens have been killed in a wave of pirate attacks plaguing the Gulf of Aden and the Indian Ocean for years.

U.S. naval forces, who were trailing the Americans’ captured yacht with four warships, quickly boarded the vessel after hearing the gunfire and tried to provide lifesaving care to the Americans, but they died of their wounds, the U.S. Central Command said in a statement from Tampa, Fla.

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