NEW YORK (AP) — Amazon says an incorrectly typed command during a routine debugging of its billing system caused the five-hour outage of some Amazon Web Services servers on Tuesday.

In a summary posted online, the Seattle company says a command meant to remove a small number of servers for one of its S3 subsystems was entered incorrectly and a larger set of servers was removed. A full restart was required, which took longer than expected due to how fast Amazon Web Services has grown over the past few years.

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Amazon says it is making changes to its system to make sure incorrect commands won’t trigger an outage of its web services in the future.

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Amazon is the world’s largest provider of cloud services, which entails hosting companies’ computing functions on remote servers.

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