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The company acknowledged its website was having issues late Sunday. The website was fully operational again mid-afternoon Monday in Malaysia.

\"Malaysia Airlines confirms that its Domain Name System (DNS) has been compromised where users are re-directed to a hacker website when www.malaysiaairlines.com URL is keyed in,\" a statement today from the airline said. \"At this stage, Malaysia Airlines' web servers are intact. The airline has resolved the issue with its service provider and the system is expected to be fully recovered within 22 hours.\"

\"Making claims of data theft is serious and should be taken seriously,\" Robert Siciliano, an online safety expert to Intel Security, told ABC News. \"Those who have information stored on the site, such as personal information and credit card numbers should take heed and take steps to ensure their accounts are secure. Monitor statements looking for unauthorized activity. Beware of phishy emails and avoid clicking links. Otherwise pay attention to news reports and look for the airline to send out a communication.\"

Malaysia Airlines said it has also reported the incident to CyberSecurity Malaysia and the country's Ministry of Transport.

Write Lizard Squad on your forehead, thanks. @MAS

— Lizard Squad (@LizardMafia) January 26, 2015

Lizard Squad has previously claimed responsibility through tweets for attacking the Sony PlayStation and Xbox networks over Christmas, and earlier this month, the \"Cyber Caliphate\" briefly took over the Twitter and YouTube accounts of U.S. Central Command, authorities said.

Known for its trollish and prankster style, Lizard Squad's weapon of choice is most commonly the DDoS (distributed denial of service attacks), which flood a target's servers with fake traffic, knocking it offline.

While authorities have Lizard Squad on their radar, making arrests has proven to be difficult as the tech savvy group is dispersed around the world.

After a joint investigation between the FBI and authorities in the United Kingdom, an 18-year-old man was arrested earlier this month in northwest England as part of an investigation into the Christmas gaming attacks.

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