Amazon is closing its Fresh grocery stores and Go convenience stores, the company said Tuesday. It will convert some stores to Whole Foods locations.

Amazon's top grocery executive Jason Buechel told staff that the company needs to make more "deliberate choices" to win over customers.

The company announced in a blog post on Wednesday that it is shutting down both its grocery and automated grab-and-go convenience stores, Amazon Fresh and Amazon Go, marking the end of yet another failed experiment to crack brick-and-mortar retail.

The $883 billion U.S. grocery market is turning into a knife fight between two very different retail empires. Walmart still rules the weekly shop, but Amazon is now openly designing stores, warehouses,

Internal documents show Amazon is reshaping its retail infrastructure to compete head-on with Walmart's Supercenter model.