Bombs found during a security operation in Newry had the potential to kill, police have said.
The security alert caused several days of disruption
One device exploded, but did not cause any damage or injuries, while Army experts carried out a controlled explosion on the second.
The alert began on Sunday after a claim that a device had been left in the Upper Fathom Road area, near Cloghogue roundabout.
Police suspect dissident republicans are behind the attack.
"Although the device was made safe, it was nevertheless an attack on all of the positive steps forward local communities and the police have taken in recent years," Chief Inspector Christine McCullough said.
"Police are working closely with communities across Newry and Mourne to tackle crime and the fear of crime."
The alert caused disruption to the road and rail network for several days.