A 45-year-old Dublin man who was arrested on suspicion of withholding information about the gangland murder of Noel 'Kingsize' Duggan remained in garda custody last night.
It is understood the man was arrested on Monday afternoon during a search conducted by gardai seeking evidence about vehicles used in Duggan's killing last month.
The suspect is being detained at Ashbourne Garda Station in Co Meath.
Sources said officers carried out a number of searches in the Clondalkin and Crumlin areas of Dublin.
Father-of-three Duggan, a close friend of Gerry 'The Monk' Hutch, was shot dead in his car outside his house on the Old Mill estate in Ratoath, Co Meath, on the night of March 23.
Monday's arrest is the first directly connected to any of the four murders linked to the bloody Kinahan-Hutch feud.
Since Duggan's shooting, gardai have been involved in a massive investigation which has so far mainly involved the analysis of CCTV.
The cigarette smuggler knew his life was under threat because of his long-standing friendship with Hutch.
A man in dark clothing was seen fleeing the scene. He ran to a waiting dark-coloured BMW on Fairyhouse Road before it sped a short distance to the Cairn Court housing estate, where it was set alight.
The two men got into a dark saloon car, heading in the direction of Ratoath village.
Gardai in Ashbourne have been investigating whether 'Kingsize' was shot dead by the same assassination team that murdered Eddie Hutch in Dublin's north inner city six weeks earlier.