Nintendo announced that Club Nintendo, its member rewards site in Japan, has been hacked. The security breach was discovered when Nintendo noticed a large number of access errors on July 2. This prompted Nintendo to conduct a deeper investigation. Looking further into the issue, Nintendo found 23,000 instances of unauthorized log-ins (with 15 million attempts) between June 9 and July 4 on Japan's Club Nintendo site. The security breach does not apply to Club Nintendo sites in other countries, according to Nintendo.