Two people were injured Tuesday morning in a fiery crash near Arlington, South Dakota that involved four semi-trucks.
The crash happened on Highway 14, one mile west of Arlington, the patrol said in a tweet.
Two people sustained what appear to be minor injuries, Highway Patrol spokesman Tony Mangan said.
All drivers are accounted for, the patrol said. The cause of the crash is still under investigation.
Only one lane is open while crews clean up the crash scene, Mangan said. Traffic is slowed as both directions of traffic are being allowed through on an alternating basis, he said.