Teenage twin brothers were killed and six of their friends injured after attempting to use their own toboggan on the bobsled track at Canada Olympic Park.
The 17-year-olds were pronounced dead at the scene and six others were taken to hospital.
"Part way down, the group hit a large gate used to separate the bobsled and luge tracks," according to police.
Sergeant Paul Wyatt said police are continuing their efforts to identify all those involved.
But it has been difficult due to the nature of the injuries, he said.
He said the survivors are "severely traumatised" and investigators are at hospital waiting to speak with them.
Barry Heck, the CEO of site operator WinSport, said the incident has devastated the non-profit organisation that operates Canada Olympic Park.
The company said it is working with the Calgary Police Service in their investigation and will conduct its own review as well.
Local Councillor Richard Pootmans offered his condolences to the victims' families and friends.
"It sounds like an awful accident, and clearly we'll have lots of questions, but today we just wish to express our sorrow to the family," he said.
