
From the PlayStation official blog:
Like other major networks around the world, the PlayStation Network and Sony Entertainment Network have been impacted by an attempt to overwhelm our network with artificially high traffic.
Although this has impacted your ability to access our network and enjoy our services, no personal information has been accessed.
We will continue to work towards fixing this issue and hope to have our services up and running as soon as possible.
We regret any inconvenience this may have caused.
The company also confirmed the attack via their official Twitter account informing their followers that their ‘engineers are aware of the issues and are working to resolve them.’
Network update: our engineers are aware of the issues and are working to resolve them. We'll keep you posted – sorry for the inconvenience
— PlayStation (@PlayStation) August 24, 2014
Services will be gradually restored. For some it's up now. For others the route they take may be flooded so they can't log in yet.
— John Smedley (@j_smedley) August 24, 2014