KUALA LUMPUR - The Malaysia Airlines website was commandeered Monday by hackers who referenced the Islamic State jihadists and claimed to be from the "Lizard Squad", a group known for previous denial-of-service attacks.
The website's front page was replaced with an image of a tuxedo-wearing lizard, and read "Hacked by LIZARD SQUAD - OFFICIAL CYBER CALIPHATE".
It also carried the headline "404 - Plane Not Found", an apparent reference to the airlines' puzzling loss of flight MH370 last year with 239 people aboard.
Media reports said versions of the takeover in some regions included the wording "ISIS will prevail".
The airline did not immediately respond to a request for comment.
The Lizard Squad is a group of hackers that has caused havoc in the online world before, taking credit for attacks that took down the Sony PlayStation Network and Microsoft's Xbox Live network last month.
The Islamic State, an extremist Sunni Muslim group, has seized large swathes of Syria and Iraq, where it has declared an Islamic "caliphate".
It has drawn thousands of fighters from across the globe to its anti-Western cause, and shocked the world with its video-taped executions of journalists and other foreigners it has captured, the most recent being a Japanese security contractor it claimed Sunday to have beheaded.
A second Japanese captive being held by the militants has also been threatened with execution.
The IS group, which uses social media in recruiting and spreading its message, is believed to harbour ambitions of launching a cyber-war against the West.
It is unclear why Malaysia Airlines was targeted.
But concern has been rising in Malaysia after scores of its citizens were lured to the IS cause in the Middle East. Malaysian authorities last week said they have detained 120 people suspected of having IS sympathies or planning to travel to Syria.