Twin 17-year-old brothers were killed early Saturday at Calgary's Olympic park after they snuck onto the bobsled track with a group of friends and tried to sled down it, reports Sky News. "Part way down, the group hit a large gate used to separate the bobsled and luge tracks," police said in a statement. Dead are Jordan and Evan Caldwell, mourned as "bright lights" in a statement from their family. Six teenage boys who were with them were also injured in the accident, reports NBC News; their injuries ranged from minor to serious, with police noting that some weren't immediately identifiable because of their injuries. The Calgary track was part of the 1988 Winter Olympics. Police are reviewing security footage to see how the boys broke onto the track. (More Calgary stories.)