The San Diego County Sheriff's Department confirms a deputy shot a suspect near the racetrack entrance, but did not immediately comment on the events leading up to the shooting.
The shooting, which occurred during the final race of the day, created a chaotic scene at the venue.
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The man had been trying to buy a ticket to the concert featuring the rapper Sunday at the Del Mar Fairgrounds in San Diego, the department said in a statement. The concerts take place at the Seaside Stage, which is located near the west end of the racetrack's Grandstand.
KFMB-TV says no other injuries were reported as of Sunday evening.
Del Mar's official Twitter account said at 6:37 p.m. PT that the concert was officially "sold out".
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As the field for the race pulled up past the finish, TVG host Todd Schrupp exclaimed, "There's gunfire at the track".
Deputies returned fire, according to the sheriff's office, and the man was struck.
Video provided by Fox San Diego showed deputies struggling with a man in a white shirt on the ground.
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Several Twitter users shared clips of television coverage of the race by horse racing network TVG, in which the sound of gunfire is audible and an announcer is heard shouting, "There is gunfire at the track". "The involved deputies were not injured".