The shooting unfolded just after 9:30 p.m. Sunday at a small fair in the Pacoima area.
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Police say it all stemmed from an argument between two men.
At one point, the suspect pulled out a gun and shot a 19-year-old, who is expected to survive.
Video obtained by Eyewitness News from a viewer who was riding the Ferris wheel at the time shows a bird's-eye view of the crowd moments after the shooting occurred.
You can see people running once shots were fired.
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It's unclear what led to the argument. Meanwhile, the shooter has not yet been found and no arrests have been made.
Anyone with information is urged to contact police