Two pipe bombs have exploded in Co Armagh and two further bombs have been found in Co Antrim.
Police said three people were in the house in Windmill Avenue in Armagh when the bombs exploded last night.
No one was injured but the front door of the house was damaged.
Officers are working to establish a motive.
Forensics at the scene of last night’s pipe bomb attack. Three ppl escaped injury after the 2 devices exploded at the front of the property in Windmill Avenue in Armagh. #UTV pic.twitter.com/4FQmbZLskI
— Sara Moore (@saramoore_utv) April 17, 2019
Two other viable pipe bombs were found in a security alert in Rasharkin last night.
Several people had to leave their homes in Moneyleck Park after the alarm was raised at about 10pm.
One device was found on a windowsill outside a house while the second was thrown through a front window.
Sinn Féin MLA Philip McGuigan said more than 20 homes in Moneyleck Park and Finvoy Road had been evacuated.
The alert ended this morning and people have been allowed to return to their homes.
Over in Rasharkin. Two suspect devices. Residents having to be evacuated. pic.twitter.com/4zCVZixOKj
— Philip McGuigan (@mcguigan_philip) April 16, 2019