Four people were injured when a semi-truck rolled on I-5 south near Federal Way on Thursday.

Shortly before noon, South King Fire and Rescue crews responded to the freeway just south of S. 272nd Street for reports of a multiple vehicle collision.

A semi trailer detached from the truck, leaving the trailer on its side in the roadway, according to a tweet from South King Fire. The truck drove through a road barrier and rolled onto its side.

Two patients suffered non-life-threatening injuries and two additional patients have minor injuries. One of the patients was transported to a local hospital.

Large debris remains in and near the roadway, leaving several freeway lanes closed. Drivers should expect delays and take alternate routes.

Washington State Patrol and the Department of Transporation are investigating the cause of the accident.