UPDATE: According to the official AskPlayStation twitter account, PSN is back up.

@NiveK_US If you were having issues with PSN earlier, please try again now. — Ask PlayStation (@AskPlayStation) December 8, 2014

The original story appears below.

Sony's PlayStation Network Service is currently experiencing issues, with some users unable to login. PlayStation posted on its official Twitter account that it was investigating the issues.

PSN update: we are aware of the issues some users are experiencing, and are working to address them. We'll keep you updated. — PlayStation (@PlayStation) December 8, 2014

Prior to the announcement, hacker group Lizard Squad claimed that it had brought the service offline, tweeting "PSN Login #offline #LizardSquad"

Similarly, a few days ago the group claimed responsibility for bringing Microsoft's Xbox Live service to a halt on the Xbox 360. According to the Xbox Live Status page, it continues to suffer from limited services. Are you experiencing issues logging in to PSN or Xbox Live? Let us know in the comments below.