Walmart workers grapple with heightened fears in the aftermath of deadly shootings

"If someone wants to walk in my store with an AK-47 and start shooting there's nothing I can do about it," a Walmart employee said.

Walmart plans review in the wake of deadly shootings, saying it will 'look at everything … from every angle' — but will continue to sell guns

Walmart offers active-shooter training to more than 1 million employees during orientation and on a quarterly basis thereafter.