That purported Grand Theft Auto VI leak appears to be real. Rockstar Games has confirmed the authenticity of the leak in a tweet, noting that a hacker stole confidential data including “early development footage” of the next Grand Theft Auto title. The firm didn’t foresee any long-term damage to development or live services like GTA Online, but was “extremely disappointed” that details of the future game were shared in this manner,

Rockstar promised another update “soon,” and that creation of GTA VI would continue “as planned.” The game producer didn’t share more. However, Windows Centralnotes parent company Take Two has asked original leak host GTAForums to pull content, which reportedly includes Bully 2 plans and might include code for multiple GTA titles. The hacker’s original Telegram channel has disappeared.

The leak is unprecedented and included 90 videos of a very early build of GTA VI. The clips appear to validate rumors from July that hinted at a return to Vice City (aka Miami) as well as a Bonnie and Clyde-like pair of male and female protagonists. There also appears to be a slew of functional upgrades ranging from improved animations to a robbery system.

The GTA VI material might not do much damage, as the finished product is likely to be much more polished. However, there is a concern that any code for GTA Online could make it easier for hackers to exploit vulnerabilities and otherwise sour the game for other players.