Update 4.30pm: In a statement, King's Hospital school confirmed gardaí and Túsla, the Child and Family Agency, are currently investigating an alleged incident at the school.
The school said no further statement would be made at this time.
Meanwhile, the Church of Ireland expressed its "sincere concern" and offered thoughts and prayers after news of the elleged incident surfaced.
A statement issdued on behalf of Archbishop Richard Clarke, Archbishop Michael Jackson and Bishop Pat Storey said:
"Following news of an alleged sexual assault at the King’s Hospital School, we express our sincere concern and offer our thoughts and prayers for the child and family at the centre of this incident.
"We trust that the process of investigation by the statutory authorities will bring about a just outcome, and we also pray for the wellbeing of the pupils and staff of the school at this difficult time."
Gardaí have confirmed that they are investigating an alleged assault at a school in the Lucan area of Dublin.
It is reported that a 13-year-old boy was sexually assaulted with a hockey stick by eight other pupils at King's Hospital school in Palmerstown last Thursday.
The Irish Times also claims a number of students have been suspended from the co-education boarding and day secondary school.
The school confirmed that the alleged incident is being investigated by Tusla, the Child and Family Agency.
It said it will make no further statement, while Tusla has said it does not comment on individual cases.