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As Southern California was hit once more by extreme heat, the Heritage Day Parade in Placentia had to be stopped after at least 61 people came down with heat-related illnesses on Saturday, according to the city’s Police Department.

Police and the Orange County Fire Authority responded to the 2150 block of Kramer Boulevard at about 11:45 a.m. after multiple people were reported to have fallen ill along the parade route, fire officials said. The location was near a middle school.

A triage station was set up at the scene. Forty units from the Fire Authority, and Fullerton, Brea, and Anaheim fire departments were assisting in treating the patients.

Nineteen people have been transported by ambulance, according to police. Official did not indicate the severity of the illnesses.

No further information about the incident has been provided.

Temperatures were forecast to reach up to a high of 105 degrees in Placentia, according to the National Weather Service. A heat advisory was in effect through 8 p.m.

Forecasters had earlier warned that Saturday would be another hot day in Orange County, with temperatures in some areas running 15- to 20- degrees above the seasonal average.

Temperatures were expected to remain about 10 degrees above normal through Tuesday, according to the weather service.