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(CNN) — A massive AWS outage Monday that brought down some of the world’s most popular apps and services all started with a glitch.

The bug – which occurred when two automated systems were trying to update the same data simultaneously – snowballed into something significantly more serious that Amazon’s engineers scrambled to fix, the company said Thursday in a postmortem assessment .

The massive cloud service’s outage meant people couldn’t order food, communicate with hospital networks, access mobile banking, or connect

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