Doctors, nurses and counsellors who dealt with the aftermath of the bomb have given harrowing accounts of what they had to cope with.
A consultant has spoken of the enormous shock of the incident, the huge number of people badly hurt and the courage of the victims and staff.
Six mental health nurses Yesterday they spoke of the conditions in corridors and of people with limbs missing. They described it as a battlefield for which only training in war zones like Vietnam could have prepared them.
Staff nurse Ms Marian Skeath, said: "I have never seen anything like this before. There was a lady and she had her family with her but there was nothing more that could be done and she was dead.
"She had to be taken off the trolley she was on and put on the floor because someone else now needed the trolley. It was an awful decision but it had to be made and made quickly.
"Her son said: `Anywhere but on the floor', so we made her a makeshift structure. I will never forget the look on her family's faces. When someone dies, they deserve the respect of a living person."
Fellow nurse Ms Alison Casement, who has been a nurse for 27 years, said: "It was like walking into a battlefield. I did not know who to go to first. It is a sight I will never forget."
Ms Margaret Quinn, another of the mental health nurses called in to help, said: "In the back of my mind I was waiting to see a member of my family."
Her colleague, Mr Thomas McFarland, said: "Nothing could have prepared me for what I saw.
"People were lying on the floor with limbs missing. People were crying for help and looking for something to kill the pain. Other people were crying out, looking for relatives.
"You could not really be trained for what you had seen unless you were trained in Vietnam or somewhere like that."
Dr Peter Garrett, a consultant physician at Omagh's Tyrone County Hospital, described Saturday as "an appalling day".
"It was a day like nobody on the team has ever experienced before. There was such an overwhelming number of people hurt.
"Doctors and nurses from England and even New Zealand were in Northern Ireland and heard about the tragedy and came straight in. Without the help of these people, we could not have coped.
"My personal memories are of the enormous shock of the incident, the huge numbers of people badly hurt and the courage of the victims and staff."
Ms Mary Brogan, a Red Cross co-ordinator, was in charge of a 12-strong team which tried to comfort some of the relatives of those killed and maimed.
"As it got to around six in the morning, they (the relatives) were starting to realise that there was less and less hope.
"We were just being there for them and holding their hands. We just tried to do whatever we could for them. It was very traumatic for all of us and a very, very long night.
"Personally, I know a lot of families myself. One of the people killed I went to school with."
Mr Ronnie Barton, clinical services manager at the hospital, said 209 injured people were admitted to casualty, with a further 71 taken to Enniskillen hospital. He added that since Sunday a further 53 patients had been taken to the Omagh hospital.
Mr David Bolton, director of community services and a veteran of the Enniskillen bomb, said it would take many weeks and months of counselling to help the people of Omagh get over the tragedy.