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By Bloomberg

Microsoft Corp.’s Xbox Live and Sony Corp.’s PlayStation Network, the Internet services video gamers use to play online, were hit by connection failures on Christmas Day, with the hackers Lizard Squad claiming responsibility.

The group, which took credit for an attack on Sony earlier this year, said on its Twitter account that it was behind the attacks. The group said it would “stop hitting” the services if users called attention to the hack by retweeting its statements.

The incident is an annoyance for Sony compared with the attack on its TV and film unit a month ago. A different group called Guardians of Peace claimed responsibility for hacking into Sony Pictures servers, destroying data, exposing Hollywood secrets, and forcing the movie studio to cancel the nationwide theater release of “The Interview.” Both groups had threatened further disruptions on Christmas Day.

“It’s not yet clear whether it’s just an outage of the PlayStation Network or if some personal data has been stolen too,” said Hideki Yasuda, a Tokyo-based analyst at Ace Research Institute. “From investors’ point of view, a data leak won’t bankrupt the company.”

Sony’s shares fell 0.5 percent to 2,545 yen as of 9:47 a.m. in Tokyo, compared with a 0.1 percent advance in Japan’s benchmark Topix index.

Game Over

Users are having difficulty signing into their online accounts and Xbox is working to fix the problem, according to an alert on Xbox Live’s website. The PlayStation Network, used to connect Sony’s gaming consoles, is experiencing similar issues.

“We are aware that some users are experiencing difficulty logging into the PSN,” Sony Computer Entertainment America said on its website. “We will update this article with any changes that occur in regards to this issue.”

E-mail and voice-mail messages to David Dennis, a spokesman for Redmond, Washington-based Microsoft, weren’t immediately returned. Two phone calls and an e-mail to Sony’s games unit in Tokyo also weren’t immediately returned.

Last week, U.S. President Barack Obama blamed North Korea for orchestrating the attacks against Sony Pictures and vowed to respond. North Korea has said it doesn’t know the identity of the hackers claiming responsibility for breaking into Sony’s computer network. The country’s connection to the Internet was also disrupted earlier this week.

Hacking Threats

Sony Pictures released “The Interview,” a comedy about a fictional assassination of North Korean leader Kim Jong Un, online yesterday via Google Inc.’s YouTube video-streaming website, the Xbox video console and www.seetheinterview.com, a website sponsored by Sony. By streaming the comedy via the Web, Microsoft and Sony took the risk of provoking denial-of-service hacking attacks. The hackers had warned that they intended to target the companies with such incidents on Christmas Day.

Denial-of-service assaults can be difficult to deflect, even if a company has ample warning they are coming, because they are executed by thousands of hacked computers performing normal but database-intensive activities, such as performing searches or downloading videos, all at the same time.

Cybercriminals targeted Sony in 2011 after it sued a young researcher when he exposed security vulnerabilities in the PlayStation 3 console. The 2011 hack involved the theft of personal data on 77 million PSN users.

“Last time the network was down for a month and PS4 sales were little affected,” Ace Research’s Yasuda said. “A network outage won’t prevent people from buying the PS4. And this time it comes after the peak shopping season, too.”