A pipe bomb exploded outside a house in Clonshaugh last night.
The improvised device appears to have been placed in a flower pot near the front door of the property at Newbury Park, where it detonated at 10pm.
It is understood that a woman in her 50s was in the house when the incident happened, but nobody was injured.
Gardai were alerted immediately and they in turn notified the army’s bomb disposal unit, which arrived at 11.40pm to carry out a post-blast analysis on the remains of the device.
They declared the scene safe at 12.50am.
A double-glazed panel in the front door of the house was shattered when the device exploded.
Gardai in Coolock are investigating the incident and have said that the development is a worrying one, as the device could have injured or killed anyone who might have picked it up or been beside it when it went off.
“This was obviously a viable device and was designed to cause harm,” a garda source said.
There were no initial reports of injuries, but paramedics from Dublin Fire Brigade were sent to the scene as a precaution.
A motive for the attack is not yet known and gardai are trying to establish why a house where innocent people live was targeted in the attack.
The scene remained sealed off this morning pending a forensic examination by members of the Garda Technical Bureau.
The remains of the device have been handed to gardai as part of their investigation.
Sources said that officers were “mystified” by the incident and detectives had no indication why the house was targeted.
There has been a marked decrease in pipe bomb incidents in the capital this year.
A previous Herald investigation revealed that around 65pc of the bombs in circulation are being made by traveller gangs, while 35pc of the devices are being manufactured by dissident Republicans.
Some of the bombs that have been discovered are so sophisticated that they have anti-movement capability and contain mercury, but most are crude items.