A school on Aughavannagh Road, Crumlin was evacuated this morning after a viable improvised explosive device was found.
An Army Bomb Disposal team rendered the device safe.
The army arrived at the scene at 10.05am and students in the school were moved to a safe location during the operation.
A cordon was also put in place for public safety.
The device was rendered safe without the need for a controlled explosion.
It was then moved to a secure military location for further technical examination and testing.
The scene was declared safe at 11.25am.