Officers from the Police Ombudsman's office are being investigated by the PSNI in relation to allegations made by a member of the ombudsman's staff.
In a statement, the ombudsman's office said the allegations, which relate to a court case, concern four members of staff and a former employee.
The four staff are at both senior and junior level within the office.
The allegations do not involve the Police Ombudsman, Nuala O'Loan, personally.
A spokesman for the office said: "We welcome a thorough police investigation of this matter and will co-operate fully with their enquiries."