PlayStation Hackers 2014: Hackers have penetrated Sony's PlayStation Network on Saturday, just a month after Sony's movie studio was accessed by unauthorised people.

According to CNET, the PlayStation Network store was targeted by PlayStation hackers this 2014 such that the service was offline for a limited time Sunday night.

When gamers tried accessing the service,  they couldn't get through and instead received a message that read "Page Not Found! It's not you. It's the Internet's fault."

Apart from the unauthorized access to the online store for games, films and TV shows, hackers may have also penetrated the gaming system since a lot of gamers complained of difficulty in playing online games.

Sony has released a statement following the incident saying, We are currently investigating the root cause for the issue."

Interestingly, before Sony could even release their investigation result, an anonymous group/individual has already declared itself responsible for the hacking incident that lasted for two hours on Sunday, reports Fox News.

The group which calls itself Lizard Squad tweeted late Sunday "PSN Login #offline #LizardSquad."

Sunday's PlayStation hacking incident comes just a month after Sony's movie studio was hacked. About 100 terabytes of Internal Sony films and files - including customer passwords, Social Security numbers of employees and contacts with celebrities - were stolen in the said attack.

That time, many speculated right away that North Korea was behind it, believing that they were propelled by their desire to get even for the forthcoming comedy film of Sony Pictures,  "The Interview."

However, North Korea quickly dispelled the theories by denouncing the Sony hack on Sunday. 

Interestingly, President of Wayland, Massachusetts-based research firm Endpoint Roger Kay opines that the first hacking incident may have opened the doors to the PlayStation Hackers 2014 in carrying out last Sunday night's unauthorised access.

"Someone else could take advantage of the trove of information that was released [following the Sony Pictures hack]," Kay said. "That could be used to attack Sony again."

This is not the first time Sony's PlayStation Network was hacked. In 2011, after a hack that compromised millions of personal information was carried out, the said network was offline for over three weeks, Computer Weekly has learned.