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The fire was started about 10:30 a.m. Saturday by a smoke-generating pyrotechnic device used at a gender reveal party in El Dorado Ranch Park, according to investigators.

Surveillance video of the incident apparently shows a person lighting the device as a couple and several children are walking nearby, CalFire investigator Capt. Bennet Milloy told CNN Monday.

After it ignites, the family is seen scrambling and grabbing water bottles to try to douse the growing fire. Everyone involved has cooperated with investigators, Milloy said.

Fire officials have not released the video, saying the investigation is ongoing.

The person who ignited the pyrotechnic could be charged with misdemeanors or felonies, depending on the level of recklessness.

“It really is a tragedy, it’s sad. They were hoping to remember the day in a different way,” Milloy said, adding that over 80% of fires are caused by humans and that people must be more aware of their surroundings. “You need to be extra cautious because you could be liable.”