U.S. officials have not determined who was behind an apparent cyberattack on the social media site X that limited access to the platform for thousands of users.

Social media platform X experienced intermittent outages, with users across the globe saying they could not access the service. X wouldn’t load for users in the U.S., UK, France and India at two points early Monday, with outages lasting a few minutes apiece. More than 40,000 users in the U.S. reported issues to the monitoring website Down Detector.

Elon Musk blamed widespread disruptions on his social media platform X on a “massive cyberattack,” which he claimed was orchestrated by a “large, coordinated group” or country. Tens of thousands of users globally reported intermittent outages on X on Monday,

Elon Musk on Monday said his X social media platform had been hit by a "massive cyberattack." In a Monday afternoon message on the platform, which according to the site DownDetector has experienced several spikes in outage reports during the day,