HBO has announced that it is investigating a breach of cyber security after hackers took control of its social media.
On Wednesday night (August 16) many Twitter accounts belonging to HBO tweeted a message claiming they had been taken over by OurMine hackers.
This hacking group has previously been responsible for attacking both Facebook creator Mark Zuckerberg and Netflix, according to Sky News.
The message said: "Hi, OurMine are here, we are just testing your security, HBO team please contact us to upgrade the security."
But in less than an hour HBO were able to gain control to the accounts again.
HBO has recently been a victim of several attacks as scripts and unreleased episodes have been leaked online.
A group of hackers named Mr Smith are said to have stolen 1.5 terabytes of data from the company.
The group has been trying to blackmail the CEO of HBO by releasing episodes of the Duplass brothers' Room 104 and Larry David's Curb Your Enthusiasm.
Scripts from Game Of Thrones have also been published although no unreleased episodes have been leaked yet.
The company also faced embarrassment this week when a GoT episode was leaked in Spain, almost a week before its scheduled release date.