Authorities in Orange County say the Airport Fire, which broke out in Trabuco Canyon near a field for remote-controlled airplanes, was unintentionally started by public works employees using heavy equipment in the area.
Officials said the employees were moving large boulders to restrict access to vegetation off Trabuco Creek Road, when sparks ignited the wildfire.
When the workers noticed smoke coming from the loader’s basket, they immediately called 911 while attempting to put the fire out with fire extinguishers.
The wildfire has since charred 5,342 acres, prompted evacuation orders and road closures and injured two firefighters and one resident, all of whom are in stable condition.