A pipe bomb was found in Ballymartin near Kilkeel in the early hours of Thursday morning (5 September).
A police spokesperson said the object secured by an ATO on the scene. The device was rendered safe and was later taken away from the scene for closer examination and tests.
Roads were later opened and residents were allowed to return to their homes once the area was declared safe.
SDLP MP for South Down Margaret Ritchie has responded to the Pipe Bomb alert saying: “I want to condemn those behind a pipe bomb which was found during a security alert in the village of Ballymartin, County Down. Those responsible are showing a reckless disregard for human life.
“The alert caused a great deal of inconvenience to residents who were moved from their home following the alert at Ballykeel Court. Families would no doubt have been deeply upset by the disruption.
“The people of South Down deserve to go about their everyday lives in peace and certainly without a threat to the safety of them or their children.
“I would urge anyone with information regarding this attack to come forward to the Police and assist them with their enquiries.”
SDLP Councillor Brian Quinn added: “The reprehensible behaviour of a delusional minority, who are jeopardising the safety of our community, is to be totally condemned.
“I fully support the police in their efforts to bring those behind this pipe bomb to justice at the soonest possible opportunity.”