gender-reveal party triggered a wildfire in southern California that’s scorched more than 7,000 acres and forced hundreds of residents to flee their homes, local fire officials said.The fire was caused by a “smoke-generating pyrotechnic device” used at a party Saturday morning in El Dorado Ranch Park in Yucaipa, about 140 kilometres east of Los Angeles, the California Department of Forestry and Fire Protection (Cal Fire) said on Sunday.“The fire spread from the park to the north on to Yucaipa Ridge that separates Mountain Home Village and Forest Falls from the City of Yucaipa,” Cal Fire officials said in a press release.“With the dry conditions and critical fire weather, it doesn’t take much to start a wildfire.