Amazon is expanding its same-day grocery delivery service to 1,000 cities and towns across the U.S., the company said Wednesday. It's also introducing thousands of perishable grocery items to its offerings,

The online retail giant plans to expand the service to 2,300 U.S. locations by year’s end in its quest to compete with Walmart.

Amazon said it will provide same-day deliveries of perishable groceries in 2,300 cities by the end of the year — more than double the current number of cities where this service is available.