Sony Corp’s PlayStation Network was offline for a second consecutive day after a hacker group allegedly attacked the networking system. Meanwhile, Microsoft Corp’s Xbox Live was back up on Friday with some limited functions after their alleged attack.

PlayStation’s official Twitter support feed said that users were having difficulties logging into the network. According to the feed, engineers were working on the problem.

Also, PlayStation Network’s website stated on Friday that it was in a scheduled maintenance period, it would be back online shortly and apologized for being offline. Other websites and the PlayStation blog were provided for users to follow.

The attack began on Christmas Day, one of the busiest gaming and gaming sales days of the year, and consisted of delays and connection problems. A hacker group called “Lizard Squad” claimed responsibility for the attack on their Twitter account. The group said it was “smacking” the gaming systems. This is just one of the several attacks the group has taken responsibility for in December.

The hackers taunted gamers via demands on Twitter Friday. The group claimed that they would stop the hack if gamers completed arbitrary requests such as liking the group’s Facebook page or retweeting their posts about PlayStation. The network still remained down even if gamers followed through with the demands.

The group continued to tweet that games such as Destiny and Call of Duty: Ghosts were available on PlayStation for free. They also continued to admit that they are the PlayStation hackers and posted tweets such as “RT IF YOU WANT MORE FREE GAMES WE HACKED PSN.”

According to Fortune Magazine, the group does not seem to be related to the hackers that attacked Sony Pictures’ network–who call themselves “Guardians of Peace”– in an effort to halt the release of The Interview, which illustrates the assassination of North Korean leader Kim Jong Un. Also, the hack on Thursday occurred just hours after Xbox’s video store started streaming the film. However, there was no evidence that the attack was connected to the film’s release in any way. Other distributors that participated in the digital release, like YouTube, remained unaffected and PlayStation is not participating.

The claims of the “Lizard Squad” have not been confirmed nor has PlayStation acknowledged the group. In addition, CNN reported that Xbox spokesman Sean McCarthy said that they do not share information on the “root cause of specific issues.”

Little is known about the group, but their Twitter profile reads as follows: “Next generation Grinch. Cyber terrorists labelled as a matter of national security.” CNN reports that the group could be from the UK or are lacking in grammar skills based on their spelling of “labelled.”

In addition to the PlayStation and Xbox Live, the PlayStation store experienced troubles with accessibility earlier this month. These problems were followed with an attack on Sony Pictures Entertainment computer systems that led to the leakage of confidential information on the Internet.

Sony’s PlayStation network is still down and representatives are continuing to work to correct the issues. The networks could be back up soon, according to the online gaming scene, because an iconic gamer supposedly intervened on the attack.