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SIMI VALLEY, Calif. - As many as 10,000 Fourth of July revelers were just settling into their seats for the fireworks show at a Simi Valley park when a bright plume of red and white bursts spread across the ground, injuring 28 people and sending others fleeing for safety.
Police in the town northwest of Los Angeles were still investigating what caused Thursday night's explosion, but early indications suggest a wooden platform designed and built to hold the fireworks gave way and tipped.
"For some unknown reasons the structure that holds these ordinances collapsed and caused them to be firing into the crowd," Simi Valley police Cmdr. Stephanie Shannon.
Four people were listed in serious condition, but their injuries were not considered life-threatening. Sixteen more were taken to hospitals with minor to moderate injuries. The remainder were treated at the park where emergency crews, already on hand as a safety precaution, set up a triage area.
Meanwhile, a worker at a fireworks show in North Myrtle Beach, S.C., was injured Thursday evening when a shell exploded prematurely. The explosion at the Cherry Grove Pier caused the show to end early, after just six minutes, and left a hole in the pier.
In Seattle, fire investigators blamed illegal fireworks for a blaze that damaged 14 boats at a storage facility as the city's official fireworks display was exploding nearby, causing an estimated $1.5 million in damages. One firefighter received minor injuries fighting the fire.
The California mishap came a year after a fireworks show in San Diego exploded in about 20 seconds and sent multiple bulb-shaped explosions over the bay. The show's producer blamed a "technical glitch," saying an error in its computer system caused tens of thousands of fireworks on four barges to go off simultaneously with a single command.
A video clip of the Simi Valley accident that aired on KCAL-TV shows a pair of firework blasts at or near the ground. Another clip, posted on YouTube and shot from a distance, shows three ground-level bursts. The fireworks continue for almost another minute before stopping.
"There was a big boom, everybody started running down the street, people were screaming," Justice Allen, 17, of Simi Valley told the Los Angeles Times. "Everybody was just terrified. People hid in bushes."
Authorities estimate people were 900 feet away from where the fireworks were being launched. One police officer who ran into the crowd when the blasts occurred had shrapnel tear through his leather belt and his clothing, Shannon said. He had minor injuries to his back.
Shannon said most people responded admirably and left in an orderly fashion. A bomb squad was at the park to deactivate the remainder of the fireworks.
Shannon said the fireworks primarily shot in one direction.
"They are going to travel the same distance across the park as they would in the air," she said. "The ones that had actually ignited that had to run their fuse were going directly into the crowd."
The annual July Fourth celebration has been sponsored by the city and the local Rotary Club for the past 43 years. Shannon said she had no information about the company hired for the fireworks show.
Simi Valley, home to the Ronald Reagan Presidential Library, is about 40 miles northwest of Los Angeles.
More than two dozen people were injured when a wood platform holding live fireworks tipped over, sending the pyrotechnics into a crowd at an annual 4th of July show northwest of Los Angeles, authorities said Friday.
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