The driver of a pick-up truck was critically injured and his 5-year-old son has serious injuries after the truck rolled over while off-roading in the Santa Cruz River late Monday night.

The crash happened shortly after 11:30 p.m. in an area west of Interstate 10 near Sunset Road, Capt. Adam Goldberg, a Northwest fire spokesman said in a news release.

The 28-year-old driver was thrown from the truck and had life-threatening injuries, the release said.

The man was taken to the hospital by helicopter.

The boy had serious injuries that were not life-threatening and he is in stable condition.

The pair were part of a group of people who were off-roading in the dry river bed, said Deputy Jesus Bañuelos, a spokesman for the Pima County Sheriff’s Department.

Detectives believe speed and alcohol were factors in the crash, he said.

The investigation is ongoing.

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