Japan's largest taxi and chauffeur operator by revenue, **Nihon Kotsu**, announced that its internal systems were compromised in a cyberattack, leading to the shutdown of parts of its infrastructure. The incident began early Saturday morning, impacting various operations. The company's crucial taxi dispatch system remains offline. **Nihon Kotsu** is a major player in Japan's transportation sector, boasting annual revenues of approximately $1 billion (¥155 billion). The company employs 18,228 people and manages a fleet of 8,558 taxis alongside over two thousand chauffeur vehicles. "We have confirmed that our internal systems were subjected to unauthorized external access (malware infection)," stated **Nihon Kotsu** in an official announcement. "Immediately after detecting the unauthorized access, we implemented emergency measures, including disconnecting systems to prevent further damage." As a direct consequence of the attack, several services are currently unavailable, including car hire, web booking, reservation management, the telephone dispatch service, and certain internal systems. For immediate car service needs, **Nihon Kotsu** has advised customers to utilize the 'GO' taxi app or visit a nearby taxi stand. In a separate notification, the company confirmed the suspension of its specialized "labor taxi" service, which caters to pregnant women close to childbirth, across key areas including Tokyo, Musashino City, Mitaka City, Tachikawa, Yokohama, and Saitama. **Nihon Kotsu** has engaged external cybersecurity experts to assist with the ongoing investigation and system recovery efforts. The company is actively exploring the possibility of data exfiltration but has not yet confirmed any such leak. Customers are urged to exercise caution and avoid opening suspicious attachments or clicking on links in communications purporting to be from **Nihon Kotsu**. At the time of reporting, no ransomware groups or cyber extortion gangs have publicly claimed responsibility for the attack.