Sony's PlayStation Network was subjected to a cyber attack by hackers, IGN reported.

A group known as the Lizard Squad claimed responsibility for the attack. Due to the hackers' actions, users of the network were unable to access the site on Sunday morning. The denial-of-service the users experienced is also known as a DDoS attack.

Aside from the attack on the network, the Lizard Squad also threatened the plane John Smedley, Sony Online Entertainment's president, was travelling in. According to the group's posts on Twitter, Smedley's plane had bombs on board, according to Tech Times.

In response to the security threat, the aircraft was taken to Phoenix and its cargo was searched for explosive devices. Fortunately, no bombs were discovered on the plane.

Following the cyber attack on the network, Sony issued a statement through its blog and reassured users that their personal information such as passwords were not leaked by the hackers.

"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," the company stated.

"Although this has impacted your ability to access our network and enjoy our services, no personal information has been accessed," Sony added.

Shortly after the recent attack on Sony, its competitor, Xbox Live, also went down. The Lizard Squad then took to Twitter to ask if Xbox Live users are experiencing problems accessing their accounts.

According to the group, the attack on Sony was in response to the U.S. military' actions against Islamic States, which are also known as ISIS or ISIL, Huffington Post reported.

"Kuffar don't get to play videogames until bombing of the ISIL stops," Lizard Squad tweeted.

Despite Lizard Squad's claims, Twitter user @FamedGod took credit for the attack on Sony.

"Why must someone take credit for ones work? Lizard Squad couldn't hurt a fly," the user posted. "Decrypting a memory dump and finding the server was all my work."