A tour bus overturned in rainy northern San Diego County Thursday, killing one person and causing several injuries, the California Highway Patrol said. A fleet of ambulances had been dispatched to the crash site to handle as many as 30 injured people. The crash occurred on southbound Interstate 15 near Fallbrook Thursday afternoon as a series of rain storms moved through the area. The bus wound up on its side, blocking several lanes of the busy freeway, UPI reported.