OREM — A retired state trooper and a Wasatch County woodworker said the teamwork of strangers helped save the lives of two people riding in a truck that flipped end-over-end on Thursday at the mouth of Provo Canyon.

About six drivers stopped at the grisly scene to help comfort the victims and search for a severed limb. They left before police could identify them. "It was a pretty impressive group effort," said Steven Hohnke, a Heber City woodworker who stopped to help.

Stacey Blevins, 32, Provo, was ejected, her arm severed below the elbow.

Francis Spencer, a 31-year Utah Highway Patrol veteran,was westbound on U-189 near the 800 North ramp when he saw a small eastbound pickup leave the road and roll.

Blevins was later flown to University Hospital in critical condition. It is unknown if the arm was reattached.

The driver, Jose Manuel Castillo, 40, Provo, was transported to Utah Valley Regional Medical Center where he is in serious condition.