On Sunday firefighters in San Bernardino County claimed they had determined the cause of the fire: a smoke generating-device used by an expectant family.
"CAL FIRE Law Enforcement has determined the El Dorado Fire, burning near Oak Glen in San Bernardino County, was caused by a smoke generating pyrotechnic device, used during a gender reveal party," it wrote on social media.
It said the fire began at 10:23 am on September 5, 2020 in the El Dorado Ranch Park in Yucaipa; it then spread from the park to the north on to Yucaipa Ridge that separates Mountain Home Village and Forest Falls from the City of Yucaipa.
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It added: "Cal Fire reminds the public that with the dry conditions and critical fire weather, it doesn't take much to start a wildfire."
"Those responsible for starting fires due to negligence or illegal activity can be held financially and criminally responsible."
The device involved is designed to emit either blue or pink smoke, depending on the baby's gender.