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.

Monday’s outage was described as a cyberattack by the official, who was not authorized to comment publicly on the matter and spoke Tuesday on the condition of anonymity. The official added that the Republican administration takes all cyberattacks against American companies seriously but underscored that the U.