What was supposed to be a day of partying and celebrations ended in tragedy after three teenagers were crushed to death during a frantic rush outside a Northern Ireland hotel.
Police said two 17-year-olds and one 16-year-old died.
A small number of people also suffered injuries as a result of the incident, police said.
The PSNI [Police Service of Northern Ireland] have now launched a massive investigation into what caused the fatal situation at the Greenvale Hotel in Cookstown.
Mr Hamilton added: "We are of an open mind.it looks like a crowd of young people, a large crowd, pushing up against the front of the hotel to get in to this event".
Earlier, the PSNI had called on parents to contact their children at the disco and to come and collect them immediately.
It said "two rapid response paramedics, two doctors and five emergency crews" had been dispatched to the scene.
"With more and more pushing, I also fell".
In an effort to understand what happened, Hamilton and the Northern Ireland police are interviewing those who are present and are asking those with footage of the incident to share it with them directly.
Having lived and worked in Cookstown for many years before I was married, I have many friends in Cookstown who are like family to me.More news: Two-thirds of Android antivirus apps are frauds
"There seems to have been struggling going on to get people up off the ground".
Northern Ireland Ambulance Service's medical director Dr Nigel Ruddell said: "Everything points towards it being a tragic accident".
It has been confirmed that two men have been arrested on suspicion of manslaughter in relation to the incident.
A TEENAGER has offered up a disturbing account of the stampede outside a St Patrick's Day disco in Co. It's scary, and you just hoped everyone was OK.
On a cold and wet night, the "crush" occurred at around 9:45 p.m., as hundreds of people were waiting to enter the Greenvale Hotel in Cookstown, County Tyrone.
"I drove past this 10 minutes before it happened, not knowing that 10 minutes later an absolute tragedy would happen".
Democratic Unionist Party leader Arlene Foster tweeted that her "thoughts and prayers" were "with everyone impacted".
In a statement on Tuesday, Detective Chief Superintendent Raymond Murray, Head of Serious Crime Branch urged people to come forward with information about the incident.
'Our thoughts are with her parents, her family and her friends in the coming days as they try to come to terms with their immeasurable loss'.