POSTED: Saturday, August 16, 2008 -- 7:00 pm

A Minnesota teenager has died after his all-terrain vehicle collided with a truck in Burnett County.

Sheriff's officials say 19-year-old Robert Clifford Humphrey was rounding a blind curve Saturday morning when his ATV crashed into a truck coming from the other direction.

A medical helicopter was called, but Humphrey died before the helicopter could depart for a hospital.

Deputies say the teen from Mahtomedi, Minnesota had ridden ATVs for years and was wearing sufficient riding gear.

Authorities say there's no evidence that drugs or alcohol were a factor in the crash.

(Copyright 2008 by The Associated Press. All Rights Reserved.)