The CHP is investigating a fatal collision in Glenn County on I-5 this morning. Two vehicles reportedly collided head-on, on the southbound lanes of I-5 near County Road 39 north of Willows before 4 am this morning. Then both cars were reportedly hit by a big rig. The CHP has reported at least one fatality and a person was reported trapped in a vehicle. Authorities reporting that the number two southbound lane is now open.