A spectator's video captured the terrifying moment a fireworks show went awry, injuring nine people in Avon, Colorado, Friday night.
In the video, posted to Twitter, a girl's excited shout of "Look!" becomes a high-pitched scream as the shells misfire into the crowd.
A shell reportedly exploded in its casing, sending two or three rockets towards the crowd.
The spectators were sitting ducks. "There was not a lot of room in between groups of people, so when it happened no one could really get up and run," one attendee told NBC News.
Show operators immediately cut off the rest of the show, and emergency services responded in less than a minute. Of the 20,000 spectators, nine were injured with "minor abrasion burns."
Deputy Chief Greg Daly, who supervised the response, put a positive spin on the accident. "This is Avon's 29th year of presenting one of the most spectacular fireworks displays in Colorado, and we have never had any failure in the production," he said. "It is wonderful news that the injuries were very minor."