The man, identified as 22-year-old Daniel Elizarraras, was taken to hospital and is expected to survive, the San Diego Sheriff's Department stated.
As the crowd panicked and fled, nearby deputies shot the man, leaving him lying on the sidewalk. Van Dyke tumbled several times after hitting the ground, lay motionless briefly, then got up on his own power and walked to the ambulance.
San Diego's FOX 5 reported that a San Diego Sheriff's Department deputy had shot a suspect near the racetrack entrance.
Emergency services set up a perimeter around the racetrack, but the situation was quickly brought back to normal.
A man shot by an officer after he opened fire at the Del Mar Fairgrounds was in stable condition on Monday, authorities said. Just half an hour after the shooting, and with the day's racing finished, the racecourse tweeted that the gangsta rap gig would go ahead as planned.
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When deputies responded to the scene just before 7 p.m., Elizarraras allegedly pulled out a handgun and fired multiple shots into the air in a crowded area. Deputies engaged and returned fire.
No other details were immediately available, and police are yet to release any information on the incident.
The racetrack, at Del Mar Fairgrounds, is located about 21 miles north of downtown San Diego along the Pacific coast.
We also are thankful for the work and training our personnel have done with the Sherriff's Department regarding possible active shooter incidents.
Del Mar's final day of racing will begin at 2 p.m. tomorrow as scheduled.