Witnesses are urged to come forward.
CCTV footage has led to police estimating that 400 people were in the queue or the car park at the time of the reported crushing incident at the Greenvale Hotel in Cookstown which left three teenagers dead.
Police have also urged young people who were queuing or in the car park of the hotel on St Patrick’s night to come forward to help them with their investigation.
In a briefing on Tuesday, Detective Chief Superintendent Raymond Murray, Head of Serious Crime Branch in the PSNI, said that young people should have no concerns about coming forward with information, even if they're underage.
"A number of parents have indicated they are concerned that their children, who may have been underage, were trying to enter a licensed premises," Murray said.
"I want to reassure you, the focus of our investigation is not the age of people who were at the event – it is about trying to find answers for the families of the three teenagers who tragically died – we need to know what you saw so the heartbroken families of Connor, Lauren and Morgan know what happened to their children."
After extending his sympathies to the families of three teenagers who tragically lost their lives, Connor Currie, Morgan Barnard and Lauren Bullock, Murray said that they'd traced the identities of over 160 witnesses and had already spoken to a number of young people.
“I want to thank everyone who has spoken with us so far, however, there is still a significant number of people who were there that night, in the queue, and I need them to come forward to speak to police so we can understand what happened," Murray said.
"Initial CCTV viewing would lead us to estimate that perhaps as many as 400 people were in the queue or car park at that time."
