UNION COUNTY – A Union County Public School bus was involved in an accident on Mill Grover Road while transporting students to Porter Ridge High School. The bus ran off the road on a curve causing the bus driver and three students to sustain minor injuries. A total of 33 students were on board when the accident occurred. Those who sustained injuries were treated and are expected to be okay. Mill Grove Road is currently closed as deputies investigate the cause of the accident. Please stay alert and avoid the area if possible.