The remains of an exploded pipe bomb which had been launched at a house in Newington Street in north Belfast were recovered by the RUC today.
A woman who lived there had alerted police that the device was in her garden.
An RUC spokesman said detectives believe the bomb was thrown during the night.
RUC were also investigating a small explosion at Brookfield Industrial Estate earlier today.
There were no injuries reported following the blast on the Crumlin Road, an RUC spokesman said.
But Ms Margaret McClenaghan, a Sinn Fein councillor for the area, insisted it was an attack designed to kill.
"This device was thrown at a group of workmen in the area who had earlier come under sectarian verbal abuse from loyalists," she claimed.
Earlier today a pipe bomb was discovered by RUC at the back gates of the Everton Complex on Ardoyne Road. The bomb was discovered at about 3 a.m. and was dealt with by a British army bomb disposal expert.
There was no repeat of Monday evening's violent scenes in the troubled interface districts of the north of the city last night.
However, two pipe bombs which failed to explode after being thrown at a Catholic home in the Oldpark district neighbouring Ardoyne were defused by the British army yesterday evening.
The devices were hurled over the "peace line" into the back yard of the house at Rosapenna Street. Sinn Fein claimed they had been thrown from the loyalist Oldpark area.
In the Ballysillan Avenue, also in north Belfast, component parts for pipe bombs were seized during a security force search. The parts, with other items, were taken away for examination. There were no arrests.
PA