Purchasing a gun in the US? Walmart just hiked the minimum age limit to 21

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Dick's Sporting Goods Inc said it will permanently stop selling assault-style rifles after the massacre at a Florida high school that has reopened a fierce debate over gun control in America.

The US retailer of camping supplies, sporting goods and guns will also stop selling high-capacity magazines and will not sell any guns to people under age 21, Dick's chief executive, Ed Stack, said in an open letter on the company's website.

Hours later, Walmart Inc, the largest US retailer, said it was raising the minimum age for the purchase of firearms and ammunition to 21 from 18. Walmart stopped selling assault-style firearms and accessories in 2015.

The announcements came the same day that classes resumed at Marjory Stoneman Douglas High School in Parkland, Florida, where 17 people, mostly students, were killed two weeks ago in one of the deadliest US mass shootings.