What was supposed to be a day of celebration took a tragic turn for three teenagers in Northern Ireland as they were killed on Sunday while planning to spend the night out in honor of St. Patrick’s Day.

A 17-year-old girl, a 17-year-old boy, and a 16-year-old boy are thought to have been crushed as they tried to enter a disco in Co Tyrone. One of the teenagers died at the scene while to other two succumbed to their injuries at a hospital.

While information is still developing, Northern Ireland Ambulance Service medical director Dr. Nigel Ruddell told the Irish Times, “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 into this event. People then seem to have fallen and then got crushed. I would urge you to use that with some caution. Certainly, it appears to be at the minute a crush, people have fallen and then been fatally injured."

Police are expected to interview attendees to learn more about what exactly took place, as reports initially claimed there seemed to be a fight that broke out, which led to the stampede.

Social Democratic and Labor Party Stormont Assembly member Patsy McGlone said the community is shocked. “People are feeling at a low ebb this morning, it is a huge loss to the community. Youngsters going out for a night at the disco on St Patrick’s night. Their families think they are safe and then the news turns differently.”

St. Patrick's Day Death Three teenagers were killed at a disco in Northern Ireland while celebrating St. Patrick's Day. Here, the service and pilgrimage to celebrate Saint Patrick's Day takes place at Saul Church on March 17, 2017 in Downpatrick, Northern Ireland. Photo: Charles McQuillan/Getty Images