UPDATE 3-Walmart to stop selling ammunition for handguns, assault-style weapons

Walmart Inc, the nation's largest retailer, said on Tuesday it would stop selling ammunition for handguns and some assault-style rifles in all its stores across the United States, calling for national action on gun safety after a string of mass shootings, including two at Walmart stores in Texas and Mississippi.Walmart is among U.S. companies, such as Delta Air Lines and Bank of America, that increasingly are responding to the debate over guns and gun safety as mass shootings have proliferated,