Kyushu Electric Power Co., Inc. says a physical security incident has occurred after a data storage drive went missing. The company has notified relevant parties and is apologising for the breach, according to reports. Multiple outlets state the missing drive contains personal information for about 10.9 million customers. The firm describes the incident as involving a physical device rather than a cyberattack, and it is working to investigate what happened and to prevent further exposure. Kyushu Electric Power is also taking steps to confirm the scope of the data affected and to respond to potential risks for customers. Authorities and other stakeholders are being informed as part of the company’s disclosure process. The reports emphasise that the affected information involves customers’ private data, though details about the specific data fields on the drive are not fully established in the provided summaries. Overall, the company’s announcement frames the event as a lost storage media incident that may put customer information at risk.