Twitter CEO Jack Dorsey’s Twitter account was hacked on Friday afternoon by a group that calls itself the Chuckle Squad. Twitter’s communications team issued a statement via Twitter.

The hackers tweeted racial slurs from Dorsey’s account. Some offensive tweets were up for about 10 minutes, though not long after the hack began, those tweets were being deleted. The hackers also plugged a Discord serve, asking people to join it. (The server invitation link tweeted out by the hackers no longer works.) “Both the server and the server owner were permanently removed from Discord within minutes of this being reported to us,” a Discord representative told The Verge.

“Encouraging any kind of hacking is in direct violation of our Terms of Service,” the representative said. “We will continue to monitor and investigate this incident.”

The tweets appear to come from Cloudhopper, a company that Twitter previously acquired to help with its SMS service. If you text 404-04 from the phone number linked to your Twitter account, that text will post to Twitter. The source in the tweet will be given as “Cloudhopper.”

Dorsey’s account has been hacked before. In 2016, the security firm OurMine hacked @Jack to send out a message about “testing your security.” The tweet also had a video and a link to OurMine’s website. (OurMine also hacked other CEOs, such as Facebook’s Mark Zuckerberg and Google’s Sundar Pichai.)

Today’s hack appears to be from the same group that attacked a number of YouTube celebrities last week on Twitter, including beauty vlogger James Charles, Shane Dawson, and comedian King Bach. The hackers also allegedly gained access to the late Desmond “Etika” Amofah’s Gmail account, as seen by screenshots collected in their Discord server. At the time, many of the people who’d been affected suggested their accounts were breached following a SIM card swap conducted by AT&T employees.

“We are working with law enforcement, have restored the customers’ service, and discussed ways to secure the account,” an AT&T spokesperson told The Verge after the previous Chuckle Squad attacks. AT&T has not responded to a request for comment today.

Other attacks that occurred on Twitter also resemble Chuckle Squad’s tactics. Riverdale’s Cole Sprouse also blamed a hack on his Twitter account on his “cell service provider.” It’s not clear if that was the same group.

The Verge has reached out to Twitter for more information about the specifics of the attack, and it will update if more information becomes available.

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