Loyalist paramilitaries have been linked to a pipe bomb attack on a family in Londonderry.
Minor damage was caused to the rear of the house
The device exploded at the rear of the house in Bond's Place at about 0200 BST on Wednesday, causing minor damage.
A Protestant family-of-five who were in the house at the time escaped injury.
A second device left outside the home of another family member a short time later turned out to be an elaborate hoax.
The woman picked it up after finding it on the doorstep of her home at Church Meadows in the nearby Kilfennan area of the city.
It is understood both incidents are being linked to a dispute between a family member and a loyalist paramilitary at the weekend.
Inspector Brian Hume said the pipe bomb was similar to those used by loyalist paramilitaries.
He said the device had been designed to kill or cause serious injury.
"It would be a very poor explosive but very capable of killing somebody," he said.
"It appears to have been wrapped in nails to cause maximum injury to anybody close to it."
William Hay of the DUP said it seemed to be a row that had got totally out of hand.
"It has to be condemned, that people feel the only way this could be resolved would be to make and throw pipe bombs in an attempt to kill or maim people."
Gerard Diver of the SDLP said people in the area wanted such attacks left in the past.
"This achieves nothing except fear, intimidation and possible death and injuries within these communities," he said.
Police say they have no doubt the attack was carried out by loyalist paramilitaries and have appealed for witnesses to come forward.