WALKER, Minn. (AP) - Authorities in northern Minnesota say a 9-year-old boy was killed in an all-terrain vehicle crash over the weekend. Cass County Sheriff Tom Burch says the crash happened on private property in rural Boy River around 5 p.m. Sunday. Deputies and first responders arrived to find the 9-year-old had been operating an ATV with a 15-year-old male passenger when they lost control in a waterhole and the ATV flipped on top of them. Crews removed the ATV from the 9-year-old but efforts to revive him failed. The passenger was treated at the scene for minor injuries. The name of the victim was not immediately released.