Update [June 8, 2021 11:55 am BST] - Fastly has now identified the issue and implemented a fix.
Several websites across the Internet, from social media platforms such as Twitch and Reddit to news outlets including the Financial Times, the Guardian, and New York Times are currently down, with users seeing the error message "Error 503 Service Unavailable". This is reportedly due to an outage of unknown origin from the cloud service company Fastly, a cloud computing company that offers services ranging from cloud security to content delivery networks (CND).
The outage has also affected government websites and shopping sites including Amazon and PayPal, while other major sites like Facebook and Twitter and messaging sites Microsoft Teams and Slack appear unaffected.
"We're currently investigating potential impact to performance with our CDN services," Fastly says on its service status page. You can check specific websites' status here and the status of Fastly servers here.
This story will be updated as more information comes in.