Convicted rapist Michael Murray will serve another 18 months in custody for hoax bomb threat phone calls directed at Government Buildings last year

Convicted rapist Michael Murray has brought a High Court challenge against sanctions he received from the Prison Authorities for allegedly making a threatening phone call stating there was a bomb at the home of the Taoiseach Simon Harris

Michael Murray (54) has 40 previous convictions for rape, sexual assault, harassment, abduction of a child, false imprisonment, threats to kill, burglary and theft

Michael Murray (52) made no reaction as the verdict was handed down in court.