Four are dead and two children are injured following a head-on collision Friday night in Morgan County. According to the Highway Patrol, a vehicle driven by 22 year old Kelsy Toebben of Jefferson City attempted to pass a tractor trailer and collided head-on with an oncoming car driven by 42 year old Philip Allen of Rolla. Both Toebben and Allen were killed in the accident as were two passengers. A 12 year old girl and a 14 year old boy were seriously injured and taken area hospitals for treatment. The accident occurred on highway 50 just east of Missouri 135.