Social media platform X went down several times on Monday following what owner Elon Musk described as a “massive cyberattack” that may have originated from Ukraine.

“There was (still is) a massive cyberattack against X,” Musk said in a post on the platform. “We get attacked every day, but this was done with a lot of resources. Either a large coordinated group and/or a country is involved. Tracing.”

The site, purchased by Musk in 2022 for $44 billion, experienced three separate outages on Monday, with the longest lasting several hours and starting around 10 a.m. ET.

During the second outage, more than 40,000 reports flooded Downdetector, with around 35,000 reports during the third, as users struggled to access the site. While a brief spike in reports occurred earlier in the day, the second and third outages caused significant disruptions, with the third lasting longer than the previous two. The issue was resolved by 1 p.m. ET, as reports steadily declined.

In a Monday afternoon interview on Fox Business Network, Elon Musk told host Larry Kudlow that the IP addresses involved in the cyberattack on X traced back to Ukraine.

“We’re not sure what happened but there was a massive cyberattack to try and bring down the X system with IP addresses originating in the Ukraine area,” Musk said during the interview with Fox Business.

His comments come amid heightened criticism from the Trump administration of Ukraine’s handling of the Russian invasion.

The hacker group Dark Storm Team claimed responsibility for the cyberattack. Founded in 2023 and linked to cyber warfare tactics aimed at high-security systems, the group reportedly  posted on Telegram that it “took Twitter offline.”

It also shared a screenshot of a real-time connectivity status page showing failed connection attempts from around the world.

The cyberattack on X is believed to have been a Distributed Denial-of-Service (DDoS) attack. These attacks flood a platform’s servers with excessive traffic, leading to slowdowns or complete outages.