CNN —A 500-acre fire in Riverside, California, that has burned homes and caused $10 million in damage was sparked by fireworks, according to local officials. The Hawarden Fire, which started Sunday, has destroyed six homes and damaged seven others, officials said. “In just over 24 hours, a moment of fireworks has an estimated cost of over $11 million. The blaze destroyed six homes in Riverside, California, officials said. As much as 90% of wildfires are started by humans, according to the group.

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Persons: Riverside Mayor Patricia Lock Dawson, ” Lock Dawson, “, Dawson, Jon Putman, CNN’s Raja Razek Organizations: CNN, Riverside Mayor, “, National Interagency Fire Center, Western Fire Chiefs Association Locations: Riverside , California, Hawarden, Oregon, California, Air, Riverside, Utah, Northern California, Southern California