Marathon Handbook reports that 30 runners from the Santa Barbara Half Marathon were treated for heat-related symptoms. The event drew about 7,500 participants. Local authorities investigated suspicious circumstances.

Santa Barbara Half Marathon organizers released a statement, emphasizing their cooperation with local authorities. They stated that the symptoms appeared typical for endurance events. The team stressed the severity of the runners' conditions. Read more everyday miles coverage.

Santa Barbara County Public Health linked the illnesses to the heat, calling it an isolated incident. Temperatures reached 80 degrees, unusual for November. The race's electrolyte drink passed inspection before the event. Related: Santa Barbara Half Marathon: 19 Runners Hospitalized, Investigation Underway.

This original Runner World brief is based on reporting from Marathon Handbook. Visit the source for its complete reporting, context and any later corrections.