Fourteen people hurt after Fourth of July firework explosion goes wrong At least 14 people have been injured due to malfunctioning fireworks at an annual 4th of July show northwest of Los Angeles. Police Cmdr. John Parks said a detonation occurred about 9:20 p.m. Thursday at the city-run Fireworks Extravaganza located at Rancho Santa Susana Community Center and Park in Simi Valley. It wasn't clear how many people were in attendance but Parks said the event usually attracts several thousand revelers. See video below... The incident occurred about 9:20 p.m. Thursday at the city-run Fireworks Extravaganza located at Rancho Santa Susana Community Center and Park in Simi Valley Jordan Roberts, a public safety dispatcher with the Ventura County Fire Department, said more than a dozen people were being taken to area hospitals with minor to moderate injuries. Emergency medical and fire personnel were already at the park to monitor the fireworks show, so the victims were attended to quickly. No other details were immediately made available. After the blast, the park was evacuated but aerial footage showed dozens of people lingering on the outskirts of the scene and near the triage area set up on the grass. Simi Valley is about 40 miles northwest of Los Angeles.