Hack group: We downed game consoles
Users of gaming consoles experienced log-in problems on Christmas Day as a hacking group claimed it was behind the trouble.
Both Xbox and PlayStation said they were aware of users having difficulties logging in to use the online gaming services.
Playstation tweeted: "We're aware that some users are having issues logging into PSN - engineers are investigating", while Microsoft, which developed the Xbox, said: "Our team of engineers is moving to find a solution as quickly as possible."
There was no official comment on the cause of the problems.
Twitter accounts under the name Lizard Squad asked followers to retweet or follow postings to get the services back online. At around 1am one account said "Attacks have stopped", but later it claimed PlayStation was down again.
A number of users posted their frustration on social networking sites about the outage.