Ireland’s health care system was forced to shut down its IT systems Friday following what it described as a “significant” ransomware attack that disrupted operations.

“There has been a ransomware attack on our IT systems,” the Health Service Executive (HSE) wrote in a post on its website. “We have shut them all down as a precaution. This has caused some disruption to our services. But most healthcare appointments will go ahead as planned.”

According to HSE, the attack meant a delay in some hospital appointments, the cancellation of a portion of virtual appointments and a delay in COVID-19 test results. The Rotunda Maternity Hospital in Dublin canceled all appointments except emergencies, and the Cork University Hospital was forced to cancel all radiotherapy and most X-ray appointments Friday.

Ambulance and emergency services were not disrupted and were continuing as normal as of Friday afternoon in Ireland, along with COVID-19 vaccine appointments.