Nintendo Japan today confirmed that around 160,000 users accounts have been illegally accessed by third-parties.
While no credit card information was exposed, affected users had their nickname, email address, date of birth, gender, and country data exposed.
Nintendo said there is currently no evidence of a breach to its databases, servers or services, but an investigation is still on-going.
As a precautionary measure, users will no longer be able to login using their Nintendo Network ID; all other sign-in options will remain available.
Nintendo will also be contacting affected users, advising them to reset their passwords and set-up two-factor authentication.
"During the investigation, in order to deter further attempts of unauthorised sign-ins, we will not reveal more information about the methods employed to gain unauthorised access," said the company in a statement.
"We apologise for the inconvenience and concerns caused to our customers, and we will continue working hard to safeguard the security of our users' data."

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