LOS ANGELES, July 13 (UPI) -- Amazon's heavily promoted Prime Day suffered a technical glitch that threatened to turn customers away on Tuesday.
Some customers early in the day complained they could not add items to their cart -- especially Amazon's "lightening Deals" -- and lost out on the savings.
Amazon took to Twitter to address customers complaints, saying it was fixing the glitch. The problem was fixed about noon, the company told CNN.
It is not known how many of the ten countries where Prime Day was available experienced problems. Only U.S. and U.K. customers were known to register complaints.
Amazon is expected to make as much as $1 billion off of the second annual Prime Day sale, available only to customers who subscribed to the $99-a-month Amazon Prime service.
Customers lit up social media last year when the company ran out of stock of sale items too quickly.