U.S. cable channel HBO confirmed today that hackers had stolen upcoming programming, and the theft included a script for an unaired episode of the hit fantasy show “Game of Thrones.” HBO, a unit of Time-Warner Inc, declined to comment on the specific programming stolen in the hack.

“As most of you have probably heard by now, there has been a cyber-incident directed at the company which has resulted in some stolen proprietary information, including some of our programming,” HBO Chairman Richard Plepler wrote in a message to employees.

The company declined to comment on reports that un-broadcasted episodes and scripts were among the data hacked, citing an “ongoing investigation” by unspecified law enforcement officials.

Hackers stole 1.5 terabytes of data and had already posted online un-broadcast episodes of “Ballers” and “Room 104,” along with “a script or treatment” for next week’s episode of “Game of Thrones.”

Reuters also received an e-mail on Sunday from a person claiming to have stolen HBO data, including “Game of Thrones.” The show is now in its seventh season and due to wrap up next year.