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

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

Gamers 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.

The Lizard Squad had previously attacked and taken down Sony's PlayStation Network as well as servers for Destiny and several EA games. 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’.