Uber Freight confirmed on Tuesday it is investigating a cybersecurity incident. A hacker group claimed on a dark web forum to have stolen company data.

An Uber Freight spokesperson stated the company is reviewing unauthorized access to a portion of its systems. The company asserted that the incident has not impacted business operations.

Data breach monitoring sites report the leak may contain nearly 5 million records. These records reportedly include names, email addresses, and phone numbers.

A law firm has launched an investigation into a potential class-action lawsuit. The full scope of the breach and specific data types remain under determination.