http://www.bbc.com/news/uk-30602609
26 December 2014 Last updated at 01:58
Xbox and PlayStation online services crash
Xbox and PlayStation online services have been suffering technical problems, amid claims a hacking group has disabled their services.
Microsoft and Sony - the companies which make the games consoles - have told customers they are aware of issues affecting their online services.
A hacking group called Lizard Squad is claiming to have caused the problems.
Microsoft and Sony have not commented on the claim, but both said they were fixing the issues.
Just before 21:00 GMT, PlayStation's official Twitter account posted: "We are still looking into the PSN (PlayStation Network) issues reported earlier. Thanks again for your continued patience today."
A message on Xbox's website says: "Hi Xbox members. Are you having a rough time signing in to Xbox Live? We're working to get this figured out right away.
"Keep trying to sign in when you get a chance. We're grateful for your patience, and we'll be sure to loop you in on our progress in 30 minutes."
'Worst Christmas ever'
Ros Bruce, from Essex, said her 10-year-old son got an Xbox One for Christmas, and he and a friend had spent weeks planning what games they would play together online.
She said they had been downloading a game since 09:00 GMT - and by 23:40 it was still not ready.
"He has spent most of the day in tears," she said.
"He says it's been his worst Christmas ever.
"I think Xbox should compensate us all."
Have you been trying to use the Xbox and PlayStation online services today? What problems have you been facing? Do you have any intelligence about the hack you can share with the BBC? Please tell us your stories by emailing haveyoursay@bbc.co.uk. If you are willing to talk to a BBC journalist, please include a contact telephone number.
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