A major U.S. hospital network has been hit by a ransomware attack that may have exposed patient records and medical information, according to a Reuters report citing the incident and the group that claimed responsibility.

The breach raises fresh concerns about the security of sensitive health data at a time when hospitals remain attractive targets for cybercriminals. Patient files can include names, contact details, treatment histories and other personal information that may be misused if leaked.

The hospital network has not publicly confirmed the full scope of the exposure, but cyberattacks on healthcare systems often trigger costly disruptions as providers work to secure networks, restore access and notify affected patients.

The case adds to a growing list of attacks targeting critical infrastructure, underscoring the risks facing institutions that store large volumes of private data and depend on uninterrupted digital systems to deliver care.