A man in his 20s has been arrested over the murder of Real IRA boss Alan Ryan.
The man was detained in the Dublin area this morning and taken in for questioning at Coolock Garda station.
The latest arrest was made under section 50 of the Criminal Justice Act 2007.
This is the fifth arrest as part of the investigation into the killing.
Ryan, who had served time in prison for firearms offences linked to his membership of the Real IRA, was shot on the afternoon of September 3rd at Grange Lodge Avenue, Clongriffin, north Dublin.
In recent years he had emerged as a key player in the organisation in Dublin, fundraising by extorting publicans and drug gangs.
Gardaí believe one of the Dublin organised crime gangs with whom he had come into conflict was behind his murder.