Tokyo rail firms report online security breaches | NHK WORLD-JAPAN News

Two railway operators in Tokyo have reported breaches of their online systems. Both say there's been no impact on their train services.

Tokyo Metro says unauthorized access to a server may have resulted in the leak of about 59,000 email addresses of members of its loyalty program.

The subway network operator says there was a glitch in its email delivery system on September 20. Five days later, it established there had been illegal access from overseas.

The company is still investigating whether other data was compromised. It has apologized for the breach and is urging people to be on the alert for suspicious emails bearing the company's name.

Another rail operator, Keio Corporation, reported on Saturday that a ransomware attack has disabled part of its sales system. The company is checking whether the breach compromised any data.