DELL RAPIDS, S.D. (AP) – The South Dakota Highway Patrol says a semi driver has died in a crash near Dell Rapids.

The health system Avera McKennan says the 34-year-old woman was one of its employees and was driving a nuclear medicine truck, a vehicle that transports radioactive material.

Avera McKennan says its experts are working with the Highway Patrol and other agencies to ensure there are no public safety issues that have not been addressed.

The patrol says the crash happened Thursday morning when the semi went over a guardrail and struck a bridge pillar along Interstate 29. The driver was the only person involved and has not been identified.

AP-WF-02-22-19 1209GMT