The stolen data was allegedly used in an attempt to blackmail Nintendo.
An unnamed man in Malaga, Spain was arrested for leaking stolen user data from Nintendo owners. It is unknown whether the data came from Nintendo's systems or a third party.
According to the Interior Ministry of Spain, the man obtained data on 4,000 Nintendo users and threatened Nintendo with a negligence report to Spain's data protection agency. When Nintendo did not respond, he began the data leak and intended to put the full user database online.
Nintendo could not give a comment on the situation due to the active investigation.