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Facebook, Instagram and WhatsApp are offline.

The websites and apps for all services responded with server errors. Reports on DownDetector.com showed that the outages appear to be widespread, but it’s unclear whether they affect all users or just some locations. What caused the failure is currently unknown.

All three platforms stopped working just before noon ET.

“We understand that some people have problems accessing our apps and products,” a spokesman said in an email statement to CNBC. “We are working to get things back to normal as soon as possible and we apologize for the inconvenience.”

In 2019, a similar outage lasted about an hour. Facebook said the outage was caused by a technical problem. Even large websites can sometimes fail when content delivery networks or CDNs go offline. This happened in June when one such CDN, Fastly, went down due to technical problems. That led to major sites like Amazon, Reddit, and The New York Times going down.

This news is evolving. Please check again for updates.