American Rounds has installed machines at eight stores so far, with hundreds more on the way. It says this is the safest way to sell ammo, but cyber and gun violence prevention experts have concerns.

Customers who bought certain grocery products at Walmart stores nationwide between October 2018 and January 2024 have until early June to file for payments, whether or not they kept their receipts.

The $25-billion deal is likely to draw intense scrutiny from federal regulators and critics as it would form a new supermarket colossus at a time of soaring food costs.

"This is a real horror and terror for all of us," said Colorado Gov. Jared Polis, who said he has shopped at the same store where gunfire erupted on Monday.