Not long after successfully taking down the Xbox Live network, a hacker group has claimed responsibility for taking Sony’s PlayStation store offline.

The hacker group, which has dubbed itself the “Lizard Squad,” posted on its Twitter account that the PlayStation store was down, and visitors to the site received a message stating: “Page Not Found! It’s not you. It’s the Internet’s fault.”

The attack was the latest in a series against Sony. Its Hollywood film studios’ corporate network was infiltrated last month, which led to a leak of some unreleased movies and some confidential information, such as actors’ salaries, according to a BBC report.

Sony Entertainment Network tweeted they were aware of problems with their network and that users were having problems connecting, thanking users’ patience as they investigated.

The Lizard Squad hit Xbox Live with a successful DDoS — distributed denial-of-service — attack, which shut down the service for a day last week. A DDoS overloads the system and prevents users from logging in.

The group warned that its attack on Xbox was just the start of what it would do this Christmas season, and the group has claimed responsibility for attacking targets like EA games and the Destiny online game in the past.

The anonymous group appears to have a Russian-based website. They have not stated any reason for their attacks. Their Twitter account simply states that “Some lizards just want to watch the world burn.”

DDoS attacks often involve saturating the target network with external communications request, preventing it from responding to legitimate users, or causing it to respond so slowly that the network becomes unavailable — also known as server overload. It basically forces a targeted computer to reset or consumes all of its resources, preventing it from providing the intended service.

DDoS is a common method by hackers attempting to take down networks. The United Kingdom outlawed denial-of-service attacks in the Police and Justice Act 2006, setting the maximum penalty at 10 years in prison. Performing a DDoS may be considered a federal crime in the United States under the Computer Fraud and Abuse Act. A conviction can also carry years of imprisonment. Most other countries also have laws against the practice, which has grown in popularity.

Many argue that the attack is actually a form of protest and should be legalized. The hacker group Anonymous posted a petition on whitehouse.gov in January 2013 asking that DDoS be recognized as legal protest, similar to that of the Occupy movement.