Update 5.30pm: The three-year old boy killed today in crash outside Oola, Co Limerick, has been named locally and by neighbours as Alex James Velocci.
His father who also died in the crash has been named locally as Marco Velocci, aged 28. Mr Velocci was born in Ireland; his father is Italian.
The boy's mother who was stabbed at her home this morning has been named locally and by neighbours as Jodie Power, aged 26. She is in a stable condition in hospital.
Update 1.54pm: The woman involved in the domestic incident which may be linked to a fatal road crash in Co Limerick today is understood to be in a stable condition in hospital.
She had been in a relationship with the man who died, but they separated about a year ago.
They were the parents of the young boy killed in the crash, who is understood to have been three years old.
Update 11.40am: Gardaí are investigating a possible link between a domestic incident and a fatal crash in Co Limerick today.
It is believed that a man, who had been living in Lattin, Co Tipperary, arrived at his ex-partner's house in Oola in Limerick at about 8.30am today.
After a subsequent altercation at the woman’s home, gardaí were alerted to the house, where they found the woman had received a number of injuries.
After the incident, the man left with the child. A short time later his Audi car crashed into an articulated truck.
Update 11.26am: Gardaí believe today's fatal crash in Limerick may be linked to an earlier domestic incident at a housing estate in Oola.
It is believed that a man was involved in an incident with his ex-partner.
The woman who was in the house received a serious injury to her arm and was removed to University Hospital Limerick.
The man then left the house with the child.
Gardaí are investigating after a man and a child were killed in a head-on collision on the Limerick to Tipperary stretch of the N24, this morning, writes David Raleigh.
A 2005 registered black coloured Audi, carrying a man and a young child, and a truck driven by another man, were in collision at around 8.30am at Brook's Bridge between Pallasgreen and Oola, Co Limerick.
The man and child in the car were pronounced dead at the scene, gardaí said.
The truck driver was not injured but is being treated for shock, gardaí added.
The investigation is being headed up by Inspector Luke Conlon, the Acting Superintendent at Bruff Garda Station.
Inspector Conlon said the road was closed in both directions with diversions in place.
LIMERICK: Collision on the N24 at Brooks Bridge on Limerick side of Oola. Road expected to be closed. Avoid. https://t.co/qvBPcgxUj8— AA Roadwatch (@aaroadwatch) July 19, 2016
"The road is likely to be closed for a good while, as we are awaiting the arrival of a Forensic Collision Inspector who is based in Cork," Insp Conlon said.
The front of the truck was seriously damaged in the impact.
A Garda source said: "It appears the front of the truck bore the brunt of it."
"The truck driver is in shock. The driver of the car and the young child have unfortunately been pronounced dead at the scene," the source added.
Gardaí have appealed to anyone who may have witnesses the collision or may have travelled this road between 8am and 8.30amto contact the Gardaí at Bruff on 061 382940, The Garda Confidential Telephone Line 1800 666 111 or any Garda Station.