Amazon is closing its Amazon Fresh grocery stores and Amazon Go automated markets, two key parts of its physical retail strategy.

Some locations will be converted into Whole Foods Market stores.

Amazon cited the challenge of creating a distinctive customer experience with a sustainable economic model for large-scale expansion.

This move continues Amazon’s retreat from brick-and-mortar retail, following past closures of bookstores, 4-Star stores, electronics kiosks, and a clothing store, Bloomberg has reported.

The company said it will support affected employees in finding other roles within Amazon.