Gardaí are believed to be spearheading an international manhunt for a suspect after the “macabre” decapitation of a man in Cork City.

As gardaí follow more than 300 lines of inquiry over the gruesome killing of Frankie Dunne, his family has said they are “numb and in shock” after his death.

The victim of a gruesome murder was not a violent man and garda sources say they do not know what he could have done, if anything, to have warranted being killed in such a brutal fashion.