A 17-year-old boy appeared before Dublin Children's Court in connection with making a hoax bomb threat.
He cannot be named due to his age.
The 17 year old had been detained in Clontarf Garda Station, but had snuck a mobile phone in with him and faked a northern accent when he made two 999 calls from inside a holding cell.
Judge Paul Kelly heard at Dublin Children's Court that the teen threatened to detonate one bomb at the station unless its prisoners were let out and another bomb at a shopping centre if "Whacker Duffy" was not released from Portlaoise Prison.
A Garda then caught the teen using the phone in the station's holding cell.
Sentencing was adjourned for a probation report.
The boy, who cannot be identified because he is a minor, was charged with knowingly making a false report or report at Clontarf Garda station.
He had initially denied the charge but entered a guilty plea when his trial was about to start, and prosecution witnesses had come to court.
The teen is currently serving a sentence for other matters. He had 39 previous convictions.
Defence counsel Doireann McDonagh said her client was a creative and intelligent young man doing well in the Oberstown Detention Centre and has completed training courses.
