Army bomb disposal teams have made safe a viable explosive device in Belfast.
They were called to Kilburn Street in the south of the city after the discovery of a suspicious object last night and carried out a controlled explosion.
Householders who had to be evacuated during the alert were allowed to return home just after midnight.
A spokesman for the Police Service of Northern Ireland said the remnants of the device had been taken away for further examination.
Anyone with information is asked to contact police.
Yesterday, dissident republicans were blamed for sending a letter bomb to the Northern Ireland Secretary of State Theresa Villiers.
It was intercepted at Stormont and was the fourth letter bomb posted to public figures in the region over the past week.