Walmart says it is pledging $1 million for the recovery from the tornado that devastated Moore.
The Bentonville, Ark.-based company said Tuesday that it will make donations of cash and materials equal to $1 million.
Walmart is also sending truckloads of food, water and other basic items to serve as immediate aid.
The world's largest retailer says no customers or employees were injured in its two stores in Moore. But the company says some workers' homes were destroyed and that it is still checking on the needs of its employees.
The company is sending workers from Arkansas, Kansas, Missouri and Texas to the affected areas so members of Oklahoma crews can be with their families.