The inquiry into the Omagh bombings heard that as many as 14 men were involved in the plot, which caused the deaths of 29 people, including a woman who was pregnant with twins.
On 15 August 1998, twenty nine people were murdered, after a car bomb was detonated by the Real IRA in Omagh. 200 people were also injured.
Paul Greaney KC shared the detail regarding the involvement of 14 men in a 50 page opening submission in the latest phase of the inquest. Some of the people named are dead, with many of them having previous convictions for terrorism.
This inquiry has resumed following a six month delay, due to the volume of disclosure and the requirement for the Dáil to pass the legal framework, facilitating co operation by Irish Agencies into the UK inquiry.
A number of them were found liable in a civil action regarding the Omagh bombings or had faced trials for their alleged roles. Such names included Colm Murphy, a republican from Co Louth, now deceased.
Speaking at the inquiry, Mr Greaney stated that these people were linked by many things, including ownership or mobile telephones which were used during the bombing.
"The evidence suggests that Colm Murphy sat like a spider at the centre of the web of the plan to detonate a bomb in Omagh on 15th August 1998", Mr Greaney said.
Mr Greaney added that there were "sound reasons" to believe that Séamus Daly was in the scout car on the day in question, and that Séamus McKenna was in the car which contained the device. Both men had also been named in previous legal actions linked to the bombing.
Over the coming weeks, the inquiry will also look into the detail of the run up to the attack, including evidence of the bomb's construction, and the movements of the bomb car.
Speaking at the inquiry, Claire Hayes, whose 16 year old brother, Alan Radford died in the explosion, said: "I have been very pessimistic about the involvement of the South".
"I am reserving judgement. I said that I'll give the inquiry process everything that I possibly can and put my faith in them", she added. "So I'm hoping that that they do deliver and have kept their word, and what they said at the start of the inquiry was that they would leave no stone unturned".
Claire Hayes also said that she hopes the Government delivers on its promise to do their utmost to ensure that the truth emerges from the 1998 tragedy in Omagh.
On Thursday, Detective Superintendent, Emmet Casserly, will deliver evidence in a pre recorded video statement, where he is expected to mention issues like the theft of the car used in the blast. It was stolen in Carrickmacross, Co Monaghan, two days prior to the bombing.
Detective Superintendent Casserly's evidence in this pre recorded video has been described as a "sequence of events" statement to this inquiry.
Elsewhere, Michael Gallagher, whose son Aiden was killed in the explosion, said he hoped that a joint cross border police investigation would take place, but so far that has not materialised.
"We welcome the fact that the gardai are engaging and co-operating with the inquiry", he said. "It's not ideal insofar as the witnesses, I think it would be better, if they were actually here in the witness box so that people could ask questions, but nevertheless, we're grateful for the co-operation".
He added that it was "hugely important" that a senior garda officer was on the witness list this week.
The inquiry also shared its disappointment that the Irish Government has not allowed garda officers and other State witnesses to give evidence at different hearings into the Omagh bombings.
Paul Greaney KC has said that members of the Gardaí and other Irish agencies could provide their evidence in Belfast. But the Government chose to enact a piece of legislation where agreed questions were asked from an Irish judge, with the answers sent to the inquiry.
Acknowledging that the legislative approach was the Irish Government's "right as a sovereign state", Mr Greaney added: "We know it will have disappointed the bereaved families and survivors just as it disappointed us - but no-one should underestimate what has been achieved".
He said that the Irish Government had co operated with the inquiry and a significant amount of documentation was submitted, including 756 documents, covering over 40,000 pages.
Mr Greaney stated that the inquiry team were able to read "sensitive Government of Ireland material".
He went on to say that this material would be important to the current phase of the inquiry. (All quotes used in this piece according to RTÉ).
