A wreck involving at least one school bus and a vehicle on US Hwy. 71 south of Potter has traffic backed up in both directions. Traffic is being stopped between Shadow Mountain RV Park and Iron Mountain. Authorities on scene are the Polk County Sheriff’s Office, Mena Police Department, and Arkansas State Police. Several ambulances have been on scene transporting personal injuries. Preliminary reports are no fatalities listed at this time. Authorities are directing one-lane traffic in intervals around the scene.