'Game of Thrones' hackers dump alleged spoiler Episode 4 script online -- and promise to reveal more
Emilia Clarke, who plays Daenerys Targaryen in HBO's Game of Thrones (Screenshot/YouTube.com)

Hackers have stolen and posted online data stolen from HBO -- including what appears to be a script for next week's episode of "Game of Thrones."

The cable network confirmed the hack, which resulted in unreleased episodes of "Ballers" and "Room 104" appearing online, along with the script, reported Entertainment Weekly.

“HBO recently experienced a cyber incident, which resulted in the compromise of proprietary information,” HBO said in a statement. “We immediately began investigating the incident and are working with law enforcement and outside cybersecurity firms. Data protection is a top priority at HBO, and we take seriously our responsibility to protect the data we hold.”

The hackers, who announced the theft Sunday through an anonymous email sent to reporters, have threatened to post more stolen material online.

“Hi to all mankind," the email announced. "The greatest leak of cyber space era is happening. What’s its name? Oh I forget to tell. Its HBO and Game of Thrones……!!!!!! You are lucky to be the first pioneers to witness and download the leak. Enjoy it & spread the words. Whoever spreads well, we will have an interview with him. HBO is falling.”

HBO hasn't confirmed what content was stolen, and so far no upcoming episodes of "Game of Thrones" have leaked.