A major Melbourne health service has had to postpone some elective surgeries because of a cyber incident.
Eastern Health says the incident happened late on Tuesday, forcing many of its IT systems to be taken off-line as a precaution.
While category one elective surgery is continuing, category two and three elective procedures have been postponed.
Eastern Health operates the Box Hill, Maroondah and Healesville hospitals.
It said in a statement the incident did not compromise patient safety.