Walmart raising age to buy guns to 21

Shoppers enter the Wal-Mart store November 20, 2007 in Secaucus, New Jersey. (Photo by Jeff Zelevansky/Getty Images)

Walmart is changing its gun-purchasing policy in the wake of the deadly school shooting on Valentine's Day in Parkland, Florida, following the lead of Dick's Sporting Goods, which did the same thing earlier Wednesday.

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