PICACHO, Ariz. (AP) — Twelve people touring an ostrich farm in Pinal County were injured when the truck they were riding in rolled over.

Pinal County Sheriff's spokeswoman Navideh Forghani says the crash happened shortly after 11 a.m. Friday at the Rooster Cogburn Ostrich Ranch in Picacho.

Forghani says three of the injured, including the driver, were airlifted to a hospital.

Authorities did not yet know the cause or if anyone would face charges.

Calls to a number listed on the ranch's website went unanswered Friday.

The ranch's "Monster Truck Tours" are described as 45-minute educational tours.

The four-wheeler trucks are wheelchair-accessible with babies allowed to sit toward the front. But the back is reserved for "thrill seekers."

The ranch is just off Interstate 10, about 75 miles (121 kilometers) southeast of Phoenix.