A man and a woman have been arrested on suspicion of murder by Gardai investigating the death of a four year old boy.
Mason O' Connell sustained head injuries at a house in Rathbane in Limerick on March 13th.
He died a number of days later after being brought to Temple Street Children's Hospital in Dublin.
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Today Gardai arrested a man in his 30'[s and a woman in her 20's as part of the investigation.
They are being questioned at stations in Limerick City.
