Global shipping firm Clarksons has reported a data breach after cyberattackers gained entry through a single, isolated user account that has since been disabled.

It’s unclear at this time what data was stolen. However, a statement from Clarksons said, “Today, the person or persons behind the incident may release some data,” as Danny Palmer reports in ZDNet. The firm’s warning comes after hackers threatened to leak privileged information when Clarksons refused to pay ransom.

The UK-based firm is one of the world’s main shipbrokers, and sources vessels for the largest producers and traders of natural resources, according to Reuters. Clarksons also collects and analyzes data on merchant shipping and offshore markets, says Reuters.

Currently, the company is in the process of contacting those potentially affected, while working with authorities in response to the cyberattack.

Read the full story at ZDNet.