"The Fort," one of many crude shelters in the Big Springs area of Provo Canyon, is frequented by families and children.

The booby trap suspended above the entrance to The Fort.

A tripline designed to trigger the booby trap, which would swing into someone's head.

Sharpened sticks at the entrance of The Fort.

A tripline meant to send someone face first into the sharpened sticks.

Benjamin Steven Rutkowski, age 19, of Orem.

Kai Matthew Christensen, age 21, of Provo.