MISSION VIEJO, Calif. (KABC) -- Six people were injured in a nine-vehicle collision in Mission Viejo Sunday afternoon, officials say.The crash happened near Alicia Parkway and Jeronimo Road, according to the Orange County Fire Authority.There were six patients treated for injuries -five of them considered trauma victims who were transported to local trauma centers. Two of the victims are children.The cause of the crash remains under investigation.