HBO, 'Game of Thrones' Twitter accounts hacked by OurMine

Several official HBO Twitter accounts, including the official Game of Thrones page, were hacked in yet anothercyberattack targeting the network.

The perpetrators appeared to be the hacking group OurMine, which posted messages to the main HBO Twitter and the pages of several shows on Wednesday night. “Hi, OurMine are here, we are just testing your security, HBO team please contact us to upgrade the security," the message read. 

HBO spokesman Jeff Cusson confirmed the incident. "The infringement on our social media accounts was recognized and rectified quickly."

The messages from OurMine were deleted within the hour after they appeared.

OurMine is known for targeting celebrities and big-name businesses with their hacks, with past victims including Netflix, Marvel, Uber and Mark Zuckerberg.  

The Twitter hack comes the day after a third-party distributor accidentally posted the upcoming sixth episode of Game of Thrones' seventh season onto several European platforms Tuesday morning.

"We have learned that the upcoming episode of Game of Thrones was accidentally posted for a brief time on the HBO Nordic and HBO España platforms," HBO Europe spokesman Tom Nielsen told USA TODAY. "The error appears to have originated with a third-party vendor and the episode was removed as soon as it was recognized."

"This is not connected to the recent cyber incident at HBO in the U.S.,” he said, referencing the hack in which leakers obtained unreleased Game of Thrones scripts, emails from HBO executives and other internal documents.

A similar incident occurred last week when Episode 4 was leaked by Star India, which distributes Game of Thrones in that country. It, too, was for about an hour before being removed.