Two viable pipe bomb type devices were recovered during a security alert in Rasharkin.
And two pipe bomb type devices exploded outside a house in Armagh.
Damage was caused to the front door of the property in Windmill Avenue in Armagh at around 11.30pm. Three adults who were inside at the time were unhurt.
Inspector Ryan Moore said police are working to establish a motive for this attack and he is appealing for information.
Two viable devices meanwhile were found in the Moneyleck Park area of Rasharkin last night (Tuesday 16 April), say police.
One device was located on the windowsill outside one property while the second was thrown through a front window.
Police are currently investigating and would appeal to anyone who noticed any suspicious activity in the area or anyone with any information, to contact police on the non-emergency number 101, quoting reference number 1321 of 16/04/19.
Alternatively, information can also be provided to the independent charity Crimestoppers on 0800 555 111 which is 100% anonymous and gives people the power to speak up and stop crime.