(Portland, OR) -- An eleven-year-old Portland boy is injured following a crash involving a go-kart. Police say the boy was riding in a go-kart that was being towed behind a pickup truck when the go-kart crashed into a tree and down an embankment in the Rainier area. The boy's 22-year-old uncle was driving the truck and says the boy was steering the go-kart as he pulled it along. Authorities say the boy was wearing a helmet and a go-kart harness at the time of the crash.