Sony has confirmed that a hacking attack was to blame for its PlayStation Network being taken offline.
The company said that it had taken the PSN down voluntarily while it investigated an "external intrusion".
The system is still unavailable five days after the hack was discovered.
Users trying to connect have been met with error messages stating that the network is "undergoing maintenance" or is "suspended".
"Though this task is time-consuming, we decided it was worth the time necessary to provide the system with additional security," wrote Patrick Seybold, the company's senior director of corporate communications and social media.