The mobsters were picked up by armed gardai during a dawn raid at a property in the north inner city and are currently in custody at Store Street Garda Station. Sources do not believe that either is the gunman who actually killed Dunne in the gangland murder in a Cabra pub in April 2010 but they believe that the pair played a key role in organising the hit. The Herald can today reveal that gardai also planned to arrest the young criminal who they believe shot Dunne but he "has gone to ground." The north inner city gunman is a close associate of the two related men who are in garda custody today. Selling One of those arrested -- aged in his late 20s -- was mentioned by Spanish authorities in the four-page European Arrest Warrant they used to extradite 'Fat' Freddie Thompson to Spain last year. The warrant asserts explosive details about the criminal's role within the multi-million euro Christy Kinahan drugs organisation. This man, who comes from a flats complex in the city, was previously arrested by Spanish police as part of Operation Shovel -- the massive probe against Kinahan's organisation which revealed that his mob were selling shipments of drugs worth a staggering €1m every two months. The 'Fat' Freddie warrant alleges that the arrested criminal is a "member of this organisation in Ireland". The warrant claims that the criminal travelled to Malaga on May 7, 2010, to meet Christy Kinahan's son Daniel to discuss a major drugs shipment into Ireland. "Daniel was supposedly going to finance part of the shipment. A surveillance operation was launched in Malaga Airport and officers saw Ross Browning, another one of the persons under investigation, arrive at the airport," the warrant alleges. The Herald has previously revealed that Browning (28) was named in the warrant, which claims he was a driver for the Kinahan drugs organisation. Browning, from the north inner city, is a close associate of the men arrested yesterday. In January 2001, a 30-year-old, who is in custody today, was involved with Browning in the robbery of over £IR13,000 from a a Securicor van driver. Both men later received suspended sentences. Gardai believe the shocking murder of Dunne was sanctioned by Christy Kinahan who felt that the reckless behaviour of the gang boss was getting out of control. 'Dapper Don' Kinahan -- who is serving the last days of a jail sentence for money laundering in Belgium -- is regarded as the biggest drugs trafficker in the history of the Irish State.