Amazon.com Inc. opened a second Amazon Go checkout-free grocery store in Chicago, with a third one planned to open "soon," the Chicago Tribune reported Oct. 8, citing Dilip Kumar, vice president of technology for Amazon Go and Amazon Books.

The e-commerce giant opened its first Amazon Go store in the city on Sept. 17, according to media reports. The opening follows the official launch of Amazon's first Amazon Go store in Seattle in January after more than a year of testing. Amazon subsequently added a second outlet in its home city in August.

According to the Amazon Go website, the second Chicago store is open from 6 a.m. to 9 p.m. on weekdays and is located at 144 S. Clark St. The Chicago Tribune said that the outlet opened Oct. 8 and covers 1,200 square feet of retail space.

The cashier-less brick-and-mortar grocery store also listed a third location in the city that will open "soon" at 500 W. Madison St., Ogilvie Transportation Center. Kumar told the newspaper that Amazon Go's third Chicago store will span 1,700 square feet.

The stores will feature pre-made sandwiches, salads and snacks and packaged convenience store items similar to other Amazon Go outlets, Kumar reportedly said.

Amazon's checkout-free stores allow customers to use their smartphone app to enter Amazon Go stores. Cameras and sensors will track items taken by shoppers, add them to their virtual carts and charge their credit cards after they leave.

In September, Bloomberg News reported that the online retailer plans to open as many as 3,000 Amazon Go locations by 2021. The Chicago Tribune said Kumar declined to comment on the expansion plans but hinted at the company's plans to open more cashier-less stores in New York and San Francisco.

According to a report by The Times, the e-commerce giant also is in the process of acquiring small retail locations in the U.K. to introduce its Amazon Go stores in the country.