Sony's PlayStation network was shut down for several hours after cyber-attackers overloaded it in what's known as a distributed denial of service attack.
In a blog post Sony said no personal information had been accessed.
The network is now back online.
The group claiming responsibility for closing down the network had also tweeted suggesting there was a security threat to a flight carrying a Sony executive.
The American Airlines flight was diverted following the warning.
-bbc
Sony PlayStation network back online after cyber-attack
COMMENT