The teenage boy arrested for trespassing was released from custody without charge.
Gardaí on Pearse Street said they arrested the boy around 4pm yesterday, Saturday June 3rd.
They said a file is being prepared for the Garda Youth Diversion Programme, and no further information on the "incident of trespass" is available at this time.
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Reports suggest the boy gained access to Leinster House via Merrion Street, and some damage was caused.
A spokesperson for the House of the Oireachtas said that it does not comment on security matters.
Investigations are ongoing.