Police are investigating an accident involving a box truck in Darlington. Police said it happened in the 3600 block of Constitution Boulevard in Darlington just after 11 a.m. Investigators say the driver of the box truck went through the guide rail and the truck rolled onto its side. Officials on the scene say some diesel fuel spilled from the truck, but the spill was contained before leaked into a nearby creek. Crews plan to drain the tanks before they right the truck. Police have not yet released details on what caused the crash or if there are any injuries.