CCTV footage has led to police estimating that 400 people were in the queue or the vehicle park at the time of the reported crushing incident at the Greenvale Hotel in Cookstown which left three teenagers dead.
The 16-year-old said the teenagers were a "credit to themselves" for trying to help everybody else.
Initial inquiries indicate that a large group of young people were waiting to enter the disco and there were reports of some fighting after the incident commenced, according to a PSNI statement.
Our preliminary investigations show there was a crush towards the front door of this hotel, and in that crush people seem to have fallen.
He made a direct appeal for people with footage of the incident to hand it to the police, rather than posting it on social media.
"I would appeal to all young people who were here last night to talk through this with your parents and to come and talk to us".
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Emergency crews, paramedics and doctors were dispatched to the scene.
Former Democratic Unionist MP for South Antrim William McCrea said: "We've got to see what lessons can be learned from this tragedy".
"Unfortunately, a friend of mine who I had seen in the line and chatted to minutes beforehand has died".
"We offer our heartfelt sympathies to the families and friends of the three young people who have lost their lives".
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.
She said that pushing was "normal enough" on a night out, but added: "It just kept going and going and people just started to fall, but as one person fell another went down".
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He said: "There were ambulances passing our entrance".
Lauren Bullock (17) was described by her principal at St Patrick's College in Dungannon, Co Tyrone, as a "shining light".
Detectives from the Police Service of Northern Ireland confirmed the two arrests this evening, saying two men aged 52 and 40 had been taken into custody. "This is shocking and tragic news and our thoughts and prayers are with the families of the deceased".
It was "fortunate" more people were not killed in the incident, police said earlier today.
"Keep yourself busy, get on with your normal routine as best as you can", she added.
Sinn Féin deputy leader Michelle O'Neill called it a "parent's worst nightmare".
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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.