Update @01:05 BST: This issue is now resolved.
We are currently seeing issues with the storage on our r248.lon7 server. We are currently investigating and in contact with our infrastructure provider to resolve this as soon as possible
It appears AWS São Paulo is offline, which is affecting our server r267.gru3 and one DNS resolver. We're waiting for an update from AWS.
Our services using Google Cloud in Brazil are unaffected.
Update @22:10 UTC: All services are now back online. It appears the cause was a networking issue.