PROVO — A man accused of chasing down and threatening a man he thought was a hit-and-run driver was arrested and booked into the Utah County Jail.

A 10-year-old boy was riding a dirt bike up Hall Fork above Hobble Creek Canyon in Springville when he came around a corner and collided with a slow-moving car, said Utah County Sherriff Sgt. Jeff Jones. The boy was wearing a helmet and all the necessary safety gear but still needed medical attention for his nonlife-threatening injuries.

The driver of the car talked with the boy's father, then drove down the canyon to get cell-phone service to call an ambulance. But as the driver passed the campground where the boy's family was staying, an uncle got on an all-terrain vehicle and began following the car, thinking the man had hit his nephew and was trying to run away, according to an affidavit of probable cause filed in 4th District Court.

The uncle pulled out a gun and threatened to shoot the college-age occupants if the driver didn't pull over. He then fired a shot in the air, according to the affidavit.

Police responded to the scene and arrested the uncle for investigation of aggravated assault, brandishing a weapon, threat against life, disorderly conduct and riding an ATV in a restricted area.

He was booked into the Utah County Jail on $10,000 cash or bond bail and bailed out Monday morning.