A pipe bomb was discovered near the Co Down village of Annacloy after a security alert on Saturday.
People living near the scene of the alert at Drumnaconagher Road were asked to leave their homes after the suspicious object was found.
Army bomb experts carried out a controlled explosion and confirmed it was an explosive device.
SDLP leader Margaret Ritchie condemned the attack. The South Down MP said: "The days of violence and terrorism are long over.
"The people have rejected those who perpetrate these crimes and acts of violence at the ballot box.
"The public is saying quite clearly: 'Get off our back and leave us alone'."
The Army also removed a suspected firearm at Blackstown Road in Crumlin on Friday evening.
A police spokeswoman said the weapon was found wrapped in bed linen.