RCMP Manitoba says a young boy is dead after falling off a trailer being pulled by a tractor that a 12-year-old was driving.

On Tuesday evening in the R.M. of Grassland, a four-year-old boy was sitting on a trailer being pulled by a tractor. The boy then was thrown off of the trailer.

Authorities say when Killarney RCMP arrived at 7:40 p.m., the boy was found dead at the scene.

RCMP Forensic Collision Reconstructionist and Killarney RCMP are investigating.

Workplace Safety and Health has been notified of the incident.