Authorities say 28 people have been injured due to malfunctioning fireworks at an annual 4th of July show northwest of Los Angeles.
Twenty people were taken to hospitals late Thursday with minor to moderate injuries after the blast at a Simi Valley park.
Police say the detonation occurred about 9:20 p.m. A video clip shown on KCAL-TV shows a pair of firework blasts at or near the ground. It wasn't known how close people were to the blast's origin.
Simi Valley is about 40 miles northwest of Los Angeles.