By Shereen Siewert Four people were injured Friday in a crash involving a car and a semi tractor trailer south of New London, authorities said. The crash was reported just after 7 a.m. Friday morning on Hwy. 45 near Ledge Rock Road, according to the Wisconsin State Patrol. Police say the semi was headed northbound on Hwy. 45 in Waupaca County and collided head-on with a southbound Ford Fusion. All four occupants inside the car suffered life threatening injuries and were transported to Theda Medical Center. Their names and current conditions have not been released. The driver of the semi was not injured.