Twitter suffered a major outage on Wednesday, preventing tens of thousands of users worldwide from accessing the popular social media platform or using its main features for several hours before the services appeared to come back online.

The incident marks the first apparent large-scale outage of the social media site since billionaire Elon Musk took over Twitter as CEO in late October.

Downdetector, a website that tracks outages using a range of sources including user reports, showed over 10,000 affected users in the US, about 2,500 in Japan and about 2,500 in the UK at the height of the disruption.

Most of the reports came from users who said they encountered technical issues when accessing the social network through a web browser.

Reports of Twitter outages plummeted Wednesday night, according to the site, with some users later commenting that the service was back to normal.

Twitter didn’t immediately respond to a request for comment, and the social network’s status page showed that all systems were operational.

Musk tweeted later Wednesday that “significant changes to the core server architecture” had been introduced and that “Twitter should feel faster,” but his post didn’t mention the downtime reported by users.

During the outage, some users reported that they were unable to log into their Twitter account via desktop or laptop computers. A smaller number of users indicated that the issue also affects the mobile app and functionality, including notifications.

Others took to Twitter to share updates and memes about the service disruption, with #TwitterDown trending as a hashtag on the social media site.

Some attempts to log into Twitter from desktop computers resulted in an error message stating, “Something went wrong, but don’t worry, it’s not your fault. Let us try again.”

Musk tweeted that he could continue using the service.

“Works for me,” Musk posted, responding to a user who asked if Twitter was broken.

The outage comes two months after Musk completed his $44 billion takeover of Twitter, which was marred by chaos and controversy.

It is estimated that hundreds of Twitter employees left the social media company in November, including engineers tasked with troubleshooting bugs and preventing service outages.

Thousands of Twitter users were also impacted by a global outage in February and July prior to Musk’s takeover.

Other big tech companies have also been hit by outages this year. In July, a nearly 7-hour outage at Canada’s largest telecom operator, Rogers Telecommunications, prevented millions of people from accessing banking, transportation and government services.