A release from Union County authorities provides additional details about the crash. The ambulance was southbound on Interstate 29 when it crossed the median and crashed into the back of the Semi Tanker that was Northbound. The restrained 22-year-old male driver of the ambulance was transported to the hospital with minor injuries. A 29-year-old unrestrained female passenger was thrown from the ambulance and did not survive. The 62-year-old restrained male driver of the semi received minor injuries and refused treatment. An investigation into the crash continues.

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About 3:30 am Saturday morning multiple agencies in Union County responded to Mile Marker 8 Northbound on Interstate 29 just outside of Jefferson South Dakota for reports of a two-vehicle crash including a Midwest Medical Transport Ambulance and a Tanker Semi Truck and Trailer.

Initial reports indicate there was a fatality believed to be someone in the ambulance. Others injured said to be non-life-threatening at least one was transported to the hospital by EMS.

Agencies from North Sioux City, Jefferson and Elkpoint along with Union County Sheriff's Office, South Dakota State Patrol, and South Dakota Department of Transportation responded to the crash. Stockton Towing and Custom Sales removed the vehicles. Interstate 29 Northbound was shutdown at Exit 4 in North Sioux City, traffic was detoured on Highway 105 to Jefferson where they were allowed back on the Interstate.

The crash scene was cleared and the Interstate reopened about 11:30 am Saturday.