Multiple websites operated by news outlets including Bloomberg, the Financial Times and the New York Times were down across the world this morning, according to widespread media reports today (8 June).
Reddit, the Guardian, the Independent and the UK government website was also down.
Affected websites displayed the message: "Error 503 Service Unavailable".
Early reports have suggested it could be related to Fastly, a cloud computing provider, which underpins a lot of major websites.
UPDATE: Fastly later confirmed that it was behind the problems.
The firm said there were issues with its global content delivery network (CDN) and was implementing a fix.
In a statement on 8 June , it said: "We identified a service configuration that triggered disruption across our POPs (points of presence) globally and have disabled that configuration.
"Our global network is coming back online."
The issues began at around 11am UK time and lasted for an hour. Other affected websites included CNN and streaming sites Twitch and Hulu. The outage also broke some parts of other services, including Twitter's emojis.
Websites were also beginning to be restored, after around an hour of downtime.
