Two school busses headed toward Yosemite Valley from the Yellow Middle School in Newman, California, collided yesterday in a rear end collision. The accident occurred at about 10:55 a.m. about a mile north of the Big Oak Flat/El Portal Road intersection along the Big Oak Flat Road. There were a total of 40 children on the two busses. Early reports indicate that the injuries were minor to moderate. Children were taken by ambulance to the John C. Fremont Hospital in Mariposa, California. The cause of the collision is under investigation.