Tokyo-based travel agency Club Tourism announced Saturday that the company's Web site had been hacked and that personal information on up to 90,300 customers may have been leaked.

Company President Yoshio Ota said at a press conference that customers names, addresses, birthdates, sex and e-mail addresses may have been leaked, but not credit card or bank account numbers.

The number of customers who may have been affected accounts for about 60 percent of the 148,000 customers registered for the company's Internet membership services. The company suspended operation of its Web site Thursday soon after it found that the homepage had been hacked.

The president apologized for the incident and said the company was taking measures to ensure the security of customers' information.