(Radio Iowa) – The Plymouth County Sheriff has released the names of the two Hinton High School students killed in the auto accident Tuesday morning. Eighteen-year-old Ella Holtzen and her brother 14-year-old Harrison (Beck) Holtzen, of Sioux City, were killed when their Honda Civic collided with a pickup truck.

The investigation shows the roads were icy at the time of the accident. The driver of the Dodge Ram pickup truck, 66-year-old William Samuelson of Sioux City, was uninjured.