Two people escaped injury after a pipe bomb was thrown into their back garden in Craigavon.
The incident happened in the Einniskeen area of the town in the early hours of Thursday morning.
A person living at the house heard a loud bang to the rear of the property at around 1am.
They then found remnants of what is believed to be a pipe bomb in the back garden.
Police are working to establish a motive and are appealing for anyone with information to get in touch with detectives in Lurgan by calling 101, quoting reference number 595 of 05/07/18.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111