Japan's largest taxi operator, Nihon Kotsu, announced that its systems were compromised in a cyberattack, forcing the company to shut down part of its infrastructure.

The incident occurred over the weekend, early Saturday morning, and impacted operations, including the company's taxi dispatch system, which remains offline as of today.

Nihon Kotsu is Japan's largest taxi and chauffeur (hire) operator by group revenue, with annual revenue of roughly $1 billion (¥155 billion).

The company employs 18,228 people and operates a fleet of 8,558 taxis and more than two thousand chauffeur vehicles.

“We have confirmed that our internal systems were subjected to unauthorized external access (malware infection),” reads Nihon Kotsu’s statement (automated translation).