Caleb Moore dies after X Games accident

Caleb Moore, who was injured in a snowmobile accident at the Winter X Games in Colorado earlier this week, died on Thursday at the age of 25.

Moore was was attempting a backflip in the freestyle event last Thursday when his snowmobile's skis hit a lip in the landing area. He was thrown from the snowmobile and eventually had the machine land on him and roll over him.

Moore's death is the first fatality in the 18-year history of the X Games.