The breach is reported to involve personal data, but does not include private addresses.
There has been a major data breach involving officers and civilian staff of the Police Service of Northern Ireland (PSNI), PA understands.
The breach reportedly involves the names, ranks and other personal data, but does not involve the officers’ and civilians’ private addresses, it is understood.
The Information Commissioner’s Office (ICO) has been notified about the incident.
An ICO spokesperson said: “The Police Service of Northern Ireland has made us aware of an incident and we are assessing the information provided.”
The PSNI has been contacted for comment.