Facebook, Facebook Messenger and Instagram went down around 10 a.m. ET on Tuesday, according to Down Detector, a website that tracks user reports of telecommunications and Internet outages.

More than 25,000 users in the US reported having problems with Facebook shortly after 10 a.m., compared to a base of 17 such reports on an average day. Around 10:20 am, there were more than 538,000 reports of website problems. Around 76 percent of the complaints were about logging into the website; 17 percent of reported problems were with the app and 8 percent were with the website.

More than 91,000 people reported problems with Instagram around 10:30 a.m. and 62 percent of the reported problems had to do with the app, while 27 percent of the reports were related to the feed. More than 13,600 users reported problems with Facebook Messenger at that time, according to Down Detector and 61 percent of those users reported problems logging in, while 24 percent had problems with the app and 14 percent with sending messages.

Users also reported issues with Threads and WhatsApp, which are also owned by Meta.

The outages appeared to be affecting users around the world, with issues reported in the United Kingdom, Germany, Argentina, Japan and elsewhere.

Meta, the parent company of those sites, did not immediately respond to a question about the cause of the outage.

“We are aware that people are having trouble accessing our services,” said Meta spokesman Andy Stone. published in X. “We are working on this now.”

Meta hosts more than 3.98 billion users on its apps each month, the company reported last month.

Some users flocked to X to see if others were also having problems with those sites. One user told people not to panic if he had trouble logging in. Many users on X wondered if they had been hacked and tried to change their passwords multiple times to gain access to their accounts, without success.

The disruption comes ahead of a Wednesday deadline for Meta and other tech giants, including Apple and Google, to comply with the Digital Markets Act, a new European Union law that aims to increase competition in the digital economy. . The law requires companies to review how some of their products work so that smaller competitors can gain access to their users.

Elon Musk appeared to welcome users to his platform, posting a screenshot of Mr. Stone’s statement on . The penguins greeted another penguin labeled with the X mark.

“If you’re reading this post, it’s because our servers are up,” Musk wrote in another post.

This is a developing story.