The Japanese company revealed that it discovered the data breach after it noted a large number of access errors on the portal, internal security team believes that the hackers obtained the credentials from an outside resource. The countermeasure adopted by Nintendo is the immediate suspension of a compromised accounts and then sent to their owners, via email, the request to reset their password. Nintendo clarified that the cyber attack were concentrated in Japan only, the country has about four million registered members in the fan site Club Nintendo.