Facebook, Instagram, Messenger, and WhatsApp all went offline on Monday (October 4).
DownDetector.com shows reports of outages on Facebook spiking around 11:30 a.m. ET. At the outage's peak, over 125,000 people reported issues on the site. In addition, nearly 100,000 people reported having problems connecting to Instagram at the same time.
Facebook confirmed the outage on Twitter and said it was working to solve the issue.
"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 tweeted.
While the source of the outage has not been confirmed, The Verge reports that the issue is likely related to DNS issues. Cloudflare Senior Vice President of Emerging Tech and Incubation Dane Knecht tweeted that Facebook's "[border gateway protocol] routes have been withdrawn from the internet."