Children and staff have been evacuated from Pond Park Primary School, Lisburn due to an ongoing security alert.
Police are in attendance at the school on the Pond Park Road.
It is understood an external search was carried out on the site as part of the operation while children were kept inside.
Pupils and staff have now been moved to Laurelhill Community College while the operation continues.
PSNI Chief Inspector Derek McCamley said earlier: “I can confirm that officers are attending Pond Park Primary School due to a security alert and are speaking with staff at the school on the police operation.”