CALGARY -- Police say no one will face criminal charges in the deaths of two brothers last month who died after sliding down an Olympic luge-bobsled track in Calgary.

Twins Jordan and Evan Caldwell, who were 17, were part of a group of eight teens who climbed over a fence at around 1:10 a.m. on Feb. 6 to go on an after-hours run on three plastic sleds.

Police say the teens on the first sled, including Evan Caldwell, hit a barrier-gate and fell off their sled.

Unaware of what happened, a second group launched down the track.

"It was at this point they struck one of the already injured teens who was laying on the track, throwing all from their sled," police said in a release Monday.

"One of the teens was able to jump off the track and attempted to run back up to the starting point to warn his remaining two friends, however, they had already started down."

The third sled then came down the track with two passengers, including Jordan Caldwell, who was sitting at the front. Caldwell struck a chain that was across the course.

The Office of the Chief Medical Examiner says multiple blunt force trauma was the cause of the deaths and drugs or alcohol were not believed to have been factors.

Police said the other teens who were seriously hurt have been released from hospital. At least one will suffer life-altering injuries.

WinSport, which owns and operates the track and Canada Olympic Park, said the Caldwell brothers worked at the facility last winter.

Last month WinSport CEO Barry Heck said the company does not believe there is a problem with security at the track.