Gunfire rang out during the 10th and final televised horse race at the Del Mar Thoroughbred Club on Sunday evening.
The department says in a news release that the man, whose name and age were not given, came to the ticket window at the Del Mar Fairgrounds about 6:40 p.m.
A sheriff's deputy on Sunday shot a man who appeared to be firing a weapon into the air outside a gate leading into a scheduled Ice Cube concert at the Del Mar Racetrack. "Deputies engaged and returned fire", the statement said.
The alleged shooter was reportedly taken down by police before being rushed to hospital with gun shot wounds.
Commentators could be heard screaming "there's gunfire at the track" as the race took the place.
According to witnesses, at the end of a race at the track the crowd was getting restless as people filed in for the Ice Cube concert that was to follow the races.
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The sheriff's office said the suspect was "down" and had been taken to hospital.
Sheriff's officials confirmed there was an officer-involved shooting but would not immediately provide details.
We are aware of an ongoing San Diego Sherriff's Department investigation into an incident on the Del Mar Fairgrounds today in advance of a concert featuring the artist Ice Cube. Broadcasters calling the race live reportedly began shouting, "There's gunfire at the track, there's gunfire at the track", before cutting out the audio, The Blast reports.
As is our special events protocol, substantial law enforcement and private security was on site in anticipation of the event.
A spokesman at Del Mar Racetrack has since said the situation was "contained".