The University of Mississippi Medical Center said a ransomware attack has disrupted hospital operations statewide, forcing the medical center to close all of its clinics and cancel elective procedures for a second day as officials work to restore computer systems. University leaders said they took down parts of its network as a precaution while they evaluate the scope of the attack and whether any patients’ sensitive information was accessed.

On Friday, University officials warned that the clinic shutdown could continue for days. They said they were evaluating the extent of the ransomware incident, including whether sensitive patient information was compromised, and working to bring systems back online. The medical center also said it was reaching out to patients who require time-sensitive treatments such as chemotherapy.

Richard Bell, 55, drove from his home in Oxford to the medical center’s main campus in Jackson on Friday expecting care for bloodwork and chemotherapy, only to learn the clinics were shut down. “It was all shut down,” Bell said. “It gets pretty frustrating.” University officials said they were working on how to reschedule affected patients, with particular attention to time-sensitive treatments.

University officials said hospitals and emergency rooms remained open and patients there were receiving proper care. Vice Chancellor LouAnn Woodward said during a news conference that the attack affected “many systems,” including the electronic health record platform, and that health care providers were taking down information manually.

Woodward said investigators were still trying to determine whether patients’ private information was accessed. She also said the attackers had communicated with the university, and she did not disclose their demands. The university said it is working with the Federal Bureau of Investigation.

At the FBI’s Jackson office, FBI Special Agent in Charge Robert Eikhoff said the bureau’s “top priority” was getting systems back up to restore patient care. The FBI’s Jackson office said Friday that it could not comment further.

The attack comes as ransomware incidents affecting public institutions have proliferated in recent years, including attacks that have disrupted functions such as 911 dispatch and exposed student data, among other harms.