X, the social media app with more than 600 million users, suffered periodic outages on Monday as the result of a "massive cyberattack," Elon Musk, the owner of the private company, said.

The social media platform has been experiencing widespread outages all Monday, which CEO Elon Musk said was caused by a "massive cyberattack." The outages began before 5 a.m. Monday with around 20,000 users affected, according to Downdetector.

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