What caused the AWS outage? Is Fortnite, Roblox, Facebook back up?

AWS experienced an Outage in the early morning hours of Oct. 20, that downed more than a dozen websites. What happened?
MP1st

Roblox Down on Oct. 20 Due to Global Server Issues Affecting Multiple Services

Roblox, along with other games, are encountering server issues due to a global server outage happening this Oct. 20.

From Amazon to Roblox, how the AWS outage wrecked the internet

On October 20, an AWS outage caused widespread disruption to websites and apps, highlighting the reliance on cloud services ...

AWS outage affecting Fortnite, Roblox, Reddit, and many others is close to fixed, with Amazon saying services are showing 'significant signs of recovery'

This is because there's been an Amazon Web Services (AWS) outage across all regions, including the US, EU, and even over here ...
CNET on MSN

That Massive AWS Outage Explained: Failures and Fixes Tripping Over Themselves

It wasn't funny for anyone who couldn't access regular online destinations, or for the engineers trying to fix the problems, but Monday's massive Amazon Web Services outage was something of a comedy ...