Facebook and Instagram are finally recovering from one of the worst outages in their history

Facebook and Instagram are getting back on their feet.

The two social networks, which together have billions of users, were down for hours Wednesday in one of the worst outages in Facebook’s 15-year history. The BBC said it was the worst.

There were signs of life early Thursday morning, Eastern Time. Instagram tweeted “Anddddd… we’re back,” while reports of disruption on Facebook declined significantly. Facebook is yet to confirm it is officially back online, however.

Read more: Facebook and Instagram go down for hours in major outage

Below is a graph from DownDetector, a website where people can report outages of popular internet services, as of 4 a.m. ET.

Facebook has not disclosed the reason for the collapse of its services but has said it was not the result of a distributed-denial-of-Service cyberattack, as had been speculated.

“We’re focused on working to resolve the issue as soon as possible but can confirm that the issue is not related to a DDoS attack,” the company said on Wednesday.

Estimates suggest that the problems started at about noon ET on Wednesday. NBC Bay Area reported that the issue was caused by a database “overload.”

“We are racing to spin up new machines as others go down,” a source told the broadcaster. “Mostly resolved…but it takes time.”

This story is developing.

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