MANILA (UPDATED) - Facebook and Instagram users in several parts of the world reported that the social-network sites were inaccessible late Wednesday and early morning Thursday.

The California giant, which has more than 2 billion users, acknowledged the outage and is working to fix the problem.

"We’re aware that some people are currently having trouble accessing the Facebook family of apps. We're working to resolve the issue as soon as possible," a Facebook statement said on Twitter.

A short time later, Facebook indicated the outage was not related to an attack aimed at overwhelming the network.

"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," Facebook said, referring to what is known as a distributed denial of service cyber strike.

These people are going through withdrawal!!! They need their #Facebook🤣🤣 pic.twitter.com/yk5IHh7slz

— SunKissed (@leshandraj3) March 13, 2019

According to the website downdetector.com, outages were heaviest in North America and Europe. Users in the Philippines, Hong Kong, South Korea, and Japan also experienced the glitch.

News site USA Today also reported that some users were experiencing issues on Facebook-owned photo app Instagram.

The hashtags #facebookdown and #instagramdown quickly topped Twitter's trending topics worldwide.

Last November, a Facebook outage was attributed to a server problem and a September 2018 outage was said to be the result of "networking issues." - With a report from Agence France-Presse