Updated

A psychiatrist has pleaded guilty and been sentenced to 30 days in jail for planting booby traps that injured Oregon mountain bikers on national forest trails outside Ashland.

Dr. Jackson Dempsey apologized to the mountain bikers, his family and the medical community Wednesday in Jackson County Circuit Court in Medford. But he did not explain what led him to string nylon cords across the trails, and put nails and small trees in the path.

Besides the 30 days in jail, Judge Lorenzo Mejia ordered Dempsey to stay away from national forest trails for the two years he is on probation.

Three people suffered minor injuries running into the trees and cords.

Dempsey was a psychiatrist for Jackson County when he was arrested last July. He no longer has that job.