Police are still trying to figure out what caused a single-vehicle wreck in Webster Parish. It happened along Interstate 20 near mile marker 39, shortly after 3pm Sunday. Nine people were riding in a van, when the driver apparently lost control of the vehicle and flipped into a ditch. Life Air had to be called in, and one person was pronounced dead at the scene. The victim`s names have not been released. The cause of the crash is still under investigation.