TOKYO (AFP) - Japanese game developer Square Enix said Thursday that servers containing data on 1.8 million customers had been hacked, but said the extent of the damage was not yet known. The producer of hit titles such as Final Fantasy and Dragon Quest pulled down the Square Enix Members service shortly after discovering evidence of an intruder, said a spokeswoman. The intruder breached an unknown number of servers that could hold data for the services one million members in Japan and 800,000 members in North America, but left untouched the servers with its 300,000 European members, she said. Earlier this year entertainment giant Sony came under a series of attacks, affecting more than 100 million customer accounts in one of the largest data breaches ever.