HOT SPRINGS-Two males died Friday night after they were hit by a semi-truck one mile west of Hot Springs.

A 25-year-old male driver of a 2002 Subaru Impreza was driving eastbound on U.S. Highway 18 when he lost control and rolled the vehicle into the ditch near mile marker 33, according to the South Dakota Department of Public Safety. They have not been named by authorities.

After the driver was able to exit the vehicle, which was lying in the ditch, a 27-year-old male pulled his vehicle over to provide assistance.

While the two men stood in the ditch near the Subaru, the driver of an approaching eastbound 2016 Freightliner semi-truck hauling a flatbed trailer was approaching the scene of the rollover and lost control due to the icy road conditions and struck the two men. Both men were pronounced dead at the scene, according to the South Dakota Highway Patrol.

The 27-year-old truck driver suffered serious non-life threatening injuries and was transported by ambulance to a nearby hospital in Hot Springs. He was wearing a seat belt.

The area of the fatal crash forced U.S. Highway 18 to be closed to traffic for about six hours, according to authorities. The South Dakota Highway Patrol is conducting the ongoing investigation.