Jordan and Evan Caldwell, the twins who died early Saturday morning while attempting to toboggan down the bobsled track at Canada Olympic Park, were former employees, park officials have confirmed.

"The loss of Jordan and Evan Caldwell is being felt by many in the Calgary community, including our team here at WinSport, where the two young men worked as Hill Ambassadors during last winter's season," said Barry Heck, CEO of the organization that operates Canada Olympic Park.

The teenagers were killed and six others were injured during an after-hours visit to the track.

Police say the boys hopped on a toboggan and went for a ride on the high-speed run, but on the way down crashed into a gate separating the bobsled and luge tracks.

The twin brothers were the only fatalities in the incident, which occurred around 1:30 a.m. MT.

The other six teenage males in their group remain in hospital.

"WinSport has been running this facility for many, many years with enormous safety and sometimes there's a point where there's no more you can do," said Calgary Mayor Naheed Nenshi,

He said he would know more after returning home from a gathering in Montreal of Canada's big city mayors.

"But I have asked my colleagues in the Calgary Police Service to give us an assessment,." he said.

Heck said on Saturday that he doesn't recall any previous incidents like this one where someone broke in to use the track after hours.

"I've heard of incidents of people coming into the park. I do not know of any incidents of anyone being on the sliding track."

After being notified by Calgary police, the Caldwell family released a statement.

"We were reminded today that life is but a vapour," the family said.

"Our boys Jordan and Evan were bright lights to all who knew them. We are grieving their loss but confident in their new home of heaven. Our brief 17 years with them were a gift: filled with much love, laughter and fond memories," the statement says.

"They leave a huge void and will be sorely missed."

Nenshi said from the little he's learned of the Caldwell brothers, they were "remarkable, remarkable young men with tremendous futures."

Two memorials have been set up at the hill for those wanting to pay their respects, one at the Olympic plaque at the top of some stairs leading to the bobsled track, and the other at the top of the hill.

The park hosted events during the 1988 Winter Olympics. Several World Cup events are held at the site as well.