A two year old boy and a five year old girl were killed in the incident, which took place in Multyfarnham, Co Westmeath, on the 9th of September.
A woman in her 40s is being held at a Garda station in the midlands, in relation to the death of two children that died in a car fire in Lacken, Co Westmeath.
Two year old Mikey and five year old Thelma Dennany along with their mother Lynn Egar, were in the car at the time of the blaze.
Both children died from the incident while their mother Lynn suffered serious injuries.
Gardaí shortly launched a criminal investigation into their deaths and have now arrested a woman as part of their inquiries.
She was take into a Garda station in the midlands under section 4 of the criminal justice act.
