Elon Musk, tech billionaire and owner of X (formerly known as Twitter) said that his social media platform is under a massive cyberattack, causing it an outage.

"There was [still is] a massive cyberattack against X. 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..." Musk wrote on X.

Downdetector, an online outage-tracking service, reported that over 40,000 users experienced an X outage on Monday, with the number continuing to rise with the website experiencing intermittent outages that initially restricted 11,745 users in the US from accessing the platform as of 1:46 pm ET, with user-submitted data showing outage reports rising to around 26,579 after a brief decline and reaching as high as 40,000 earlier in the day.

A source in the internet infrastructure industry, speaking anonymously to Reuters due to a lack of authorization to discuss the matter publicly, reported that X had been hit by multiple waves of denial-of-service (DDoS) attacks starting around 9:45 UTC, a method that disrupts targeted websites by overwhelming them with rogue traffic, which can cause significant disruption.