A man has been arrested after four children were found in a "serious condition" in their home.
It is understood their injuries suggested they had been strangled.
The children were taken to Tallaght Hospital, Dublin, two of them airlifted there.
The Garda said the alleged assaults took place shortly after 7.30pm on Friday in Blainroe, County Wicklow, Ireland.
A man in his mid-30s was arrested on Friday evening and is now being held at Wicklow Garda Station.
The Garda said in a statement: "Gardai have arrested a man, mid 30s, in connection with an investigation into the serious assault of four children that occurred at Blainroe, County Wicklow yesterday, Friday June 3, shortly after 7.30pm.
"Gardai and emergency services attended the scene after the four children were discovered in a house in a serious condition. All four children were taken to Tallaght Hospital, two were airlifted.
"A man was arrested a short time later and is currently detained at Wicklow Garda Station under Section 4 of the Criminal Justice Act, 1984.
"The scene is preserved for technical examination."