UPDATE: Walmart has announced it will no longer sell firearms to anyone under the age of 21, according to the Associated Press.

BREAKING: Walmart says it will no longer sell firearms and ammunition to people younger than 21.

— The Associated Press (@AP) February 28, 2018

Check back for updates.

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PARKLAND, Fla. (AP) - Dick's Sporting Goods will immediately end sales of assault-style rifles in its stores and won't sell guns to anyone under 21 years old following the school massacre in Parkland, Florida.

Dick's Chairman and CEO Edward Stack said on ABC's "Good Morning America" on Wednesday that after the shooting the company "felt it needed to do something."

Stack says that the accused gunman, 19-year-old Nickolas Cruz, had purchased a gun at a Dick's store, but not the one used at the school shooting, even though all existing rules were followed. Stack says the system that's in place won't stop sales to dangerous people and said lawmakers must do something.

Stack said Dick's is prepared for any potential backlash, but won't change its policies on gun sales.