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CVS and Walgreens both announced Thursday that they are asking customers to no longer openly carry firearms in their stores.

The big picture: The changes follow a mass shooting last month that killed 22 at a Walmart in El Paso, Texas. Earlier this week, Walmart ended sales of ammunition for handguns and short-barrel rifle ammunition that can be used with military-style assault weapons. Walmart also asked customers to no longer open carry in their stores, which was followed by a similar request by Kroger earlier this week.

What they're saying:

  • CVS said in a tweet that it is joining a "chorus of businesses" in requesting that customers don't carry firearms in order to "ensure [their] stores remain a safe environment."
  • Shannon Watts, founder of Moms Demand Action, said: "Prohibiting open carry sends a very strong cultural signal that companies are siding with the safety of families."

Of note: All of the stores will still allow law enforcement to open carry.

Go deeper: Walmart's action on guns could pay off

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