An upcoming Game of Thrones script and two unreleased episodes of Ballers and Room 104 have leaked online after an apparent security breach at HBO, Entertainment Weekly reports. The GoT script is reportedly from the episode scheduled to air next week.

The hackers apparently claim to have 1.5 terabytes of data stolen from HBO. EW reports that the hackers sent an email to several reporters on Sunday night that contained information about the leak. The email reportedly said “HBO is falling,” and promised that more leaks would be coming soon.

Game of leaks

HBO has struggled with Game of Thrones leaks in the past. In 2015, the first four episodes of season 5 leaked online. HBO eventually confirmed that they came from advance screeners usually given to an approved group, like members of the press. In 2016, HBO Nordic, which is available in Sweden, Denmark, Norway, and Finland, accidentally released a season 6 episode a full day early.

For season 7, HBO decided not to send out any advance screeners, and asked the GoT cast to take extra security measures, like two-factoring their email accounts, to keep their scripts safe.

“The problem before us is unfortunately all too familiar in the world we now find ourselves a part of,” HBO CEO Richard Plepler wrote in an email to staff obtained by EW. “As has been the case with any challenge we have ever faced, I have absolutely no doubt that we will navigate our way through this successfully.”

The Verge has reached out to HBO for comment and will update with any new information.