Amazon.com cloud service returned to normal operations on Monday afternoon, the company said, after an internet outage that caused global turmoil among thousands of sites, including some of the web's most popular apps like Snapchat and Reddit.

Still, Amazon said some AWS services had a backlog of messages that would take a few hours to process.

AWS hosts applications and computer processes for companies around the world, and the disruption knocked workers from London to Tokyo offline and halted others from conducting normal everyday tasks like paying hairdressers or changing their airline tickets. Users on Monday afternoon had complained of lingering difficulties using services such as digital wallet Venmo and video calling site Zoom.

It was the largest internet disruption since last ye

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