The Omagh bomb inquiry has seen video footage of the moment the device exploded and the immediate aftermath.
It was filmed in McIlroy's shoe shop in the town. Photographs taken of the damage were also shown.
The video footage was shown as part of a presentation and also had audio of the Royal Ulster Constabulary (RUC) radio transmissions added.
The inquiry heard the original audio was "distressing".
The inquiry heard the RUC radio broadcast from the time of the bomb. That radio transmission however is not publicly available as it is under a reporting restriction.
At 15:04 BST on the transmission an officer can be heard saying "send over" and another officer says "this has exploded".
"Need assistance to the bottom of the town".
The inquiry heard that the explosion caused disruption to the RUC's telephone and radio systems.
The Inquiry will publish a document outlining the events that followed the bombing, including the army and emergency service responses, on its website.
The hearing was told that the first call to the RUC about the bombing came from an alarm monitoring company.
At 15:09 BST the Northern Ireland Fire Service (NIFS) was contacted by the RUC, and at 15:11 BST the Northern Ireland Ambulance Service (NIAS) received a 999 call.
Counsel to the Inquiry Nicholas de la Pour KC paid tribute to the response efforts.
"I want to acknowledge the heroism of every single person, civilian, army or emergency services who after the bomb went to help".
The focus then switched to the movements of the mobile phones linked to the bombing.
Almost 60 calls were made in the afternoon and evening the day of the bomb.
It included calls between Seamus McKenna and Seamus Daly, who counsel to the Inquiry de la Pour said in the "working hypotheses" of the inquiry were "fleeing the absolute devastation and atrocity they have caused".
And calls involving Colm Murphy and Liam Campbell were highlighted too.
The four men were tried in relation to the bomb attack in a civil case in 2009.
Earlier pre-recorded evidence from Det Supt Casserly of An Garda Síochána (Irish Police) used cell site data to show the movement off the two mobile phone numbers linked to the bombers as they made their way back into the Republic of Ireland through County Monaghan and into Dundalk.