Malaysia Airlines had its website hacked by a group that appeared to be trying to settle a score with a U.S. videogame company.

Most visitors to MalaysiaAirlines.com for several hours Monday saw a message that said “ISIS WILL PREVAIL” at the top of their browser’s window, and the airline’s ticket-booking and other services were unavailable. Instead, a large picture of a Malaysia Airlines A380 plane and the messages “404-Plane Not Found” and “Hacked by Cyber Caliphate” were displayed. The A380 is manufactured by Airbus Group NV.

Later, the site displayed a different image: a tuxedo-adorned, pipe-smoking lizard sporting a top hat and monocle. “Hacked by Lizard Squad, Official Cyber Caliphate,” it said, giving the Twitter handle for a group called Lizard Squad. A group calling itself Lizard Squad in December claimed responsibility for a cyberattack on videogame servers of Sony Corp. and Microsoft Corp.

Later Monday, the carrier replaced the hacked version of its site with a pared-down version that allowed users to book flights.

Both images displayed the Twitter handles for the accounts of what appear to be two men who work for UMG Events LLC, a company based in Roxana, Ill., that hosts videogame events across the U.S.