Facebook, Instagram and WhatsApp, three of the most-popular websites and apps in the world, were knocked offline Monday in a major internet outage.

The outage that affected the products, which are all owned and operated by Facebook, occurred around noon. Several other products that are owned and run by Facebook were also affected.

On Facebook, a simple error message read, “Sorry, something went wrong. We’re working on it and we’ll get it fixed as soon as we can.”

“We’re aware that some people are having trouble accessing our apps and products. We’re working to get things back to normal as quickly as possible, and we apologize for any inconvenience,” Facebook communications executive Andy Stone said on Twitter.

According to screenshots shared on social media, the URL for Facebook.com appeared as for sale on GoDaddy.com and other domain-buying websites.