Two men have been arrested in connection with a fire in a car that resulted in two Limerick children suffering serious injuries.

Both were arrested in Limerick City are being held at Mayorstone garda station.

The Minister for Defence, Willie O'Dea, has described the incident as 'an incomprehensible act of savagery'.

He said he had discussed progress in the investigation with senior gardaí and the evidence pointed to a deliberate attack.

Mr O'Dea said that if proven it represented an extremely worrying development.

He also said that extra gardaí would be drafted into the Moyross area of Limerick city to stop the current cycle of violence.

The two children, four-year-old Gary and six-year-old Philomena. known as 'Milly', were operated on today after receiving severe burns in the fire on Sunday.

They were in the back of the parked car at Pineview Gardens in Moyross when the blaze started. 

The youngsters are being treated at Our Lady's Hospital for Sick Children in Crumlin in Dublin.

Niall McNamara, the father of the children, has said that someone poured petrol into the back of the car and set it alight.