(CNN) Three teenagers have died in a crush at a St. Patrick's Day disco at a hotel in Northern Ireland, according to police.

Mark Hamilton, an assistant chief constable with the Police Service of Northern Ireland (PSNI), confirmed that a 17-year-old girl, a 17-year-old boy and a 16-year-old boy had died in the incident, which took place at the Greenvale Hotel in Cookstown, County Tyrone.

Police have appealed for images and video taken of the event.

Another girl, 16, was in a stable condition, while two other teenagers were treated for injuries.

"Our preliminary investigations show that there was a crush towards the front door of this hotel, and in that crush people seem to have fallen," Hamilton said in a press conference on Monday.

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.

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