Gardaí believe last night's bomb attack on a house in Finglas in Dublin could be connected to an ongoing feud between two families following the rape of a woman when she was a child.
Christopher Griffin was jailed for life last month for the rape of his partner's daughter when she was a child.
Members of his gang have been intimidating her family through shootings and bombings.
Mr Griffin was also shot and his house was bombed in retaliation.
There were no injuries after the pipe bomb attack on a house on Ratoath Drive, which took place at around 11pm last night.
It exploded under a Toyota Corolla parked in the driveway and shrapnel also caused slight damage to a house across the road.
Six people, parents and four sons and daughters aged 15 to 29 were in the house at the time.
In this feud that has been going on for over a year and a half there has been two other bomb attacks, three shootings and two murders.
The gardaí say the family attacked last night are innocent victims and not involved but may have been targeted because they are related to someone who is.
The army bomb disposal team was called to the area and the scene remains preserved for a technical examination.
Gardaí are appealing for anyone with information to contact them at Finglas Garda Station.