Gamers looking to log in to PSN or play Battle.net games such as Hearthstone, World of Warcraft, and Diablo III, may run into some difficulty, as these services -- as well as online games League of Legends and Path of Exile -- have been hit by DDoS attacks.
It's possible that EVE Online and Guild Wars 2 have also been hit. On the EVE Online forums, developers have announced DDoS issues, and users on the Guild Wars 2 forums have been reporting login issues.
In addition, the team that has claimed responsibility for the attacks -- the Lizard Squad -- has also caused the grounding of American Airlines flight 362, carrying SOE president John Smedley, by way of a bomb threat on Twitter. The flight has since been sent safely on its way.
According to its official Twitter, Blizzard has resolved its server issues, but Sony seems to be the hardest hit. On its official blog, Sony acknowledged the attack, but was careful to note that no personal information has been compromised.
"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," Sony's Sid Shuman wrote.
"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 FBI is now investigating the flight incident, an SOE representative told Kotaku. At time of writing, the reasons for the attack are still unclear.