Hackers belonging to the "Lizard Squad" claimed to have taken down Xbox Live on Monday evening, apparently by means of a DDOS attack.

The hacking group, which Attack of the Fanboy noted has been targeting gaming servers for several months, tweeted a short message at 8:37 p.m. Eastern celebrating their latest exploit: "Xbox Live #offline."

Gamers have confirmed intermittent Xbox Live service outages with numerous tweets complaining about not being able to sign into Microsoft's network and wondering when the issue will be fixed.

PCMag tried logging into Xbox Live from an Xbox 360 in Northern California at around 10 p.m. Eastern and had no success.

Microsoft did not immediately respond to a request for comment. Official Xbox blogger Larry Hyrb, a.k.a. Major Nelson, hadn't weighed in on the issue as of late Monday evening.

The Lizard Squad had previously attacked and taken down Sony's PlayStation Network as well as servers for Destiny and "several EA games," according to Attack of the Fanboy.

The site also reported that the hacking group has made some noise about launching a series of such attacks this holiday season.

"The Lizard Squad taking down Xbox Live was a 'Christmas Present' to Microsoft, the group said. They threatened this is just preparation for more things to come during the lead up to Christmas," Attack of the Fanboy reported.

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