A sheriff's deputy shot a man who reportedly fired his weapon into the air Sunday evening at a horse-racing track, the San Diego Union-Tribune reported.
Sheriffs then tasered the suspect and opened fire when tasering couldn't contain him. 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. Commentators screamed "there's gunfire at the track", before abandoning their posts and fleeing.
A spokesman at Del Mar Racetrack has since said the situation was "contained".
Seconds after the horses in Del Mar's 10th and final race crossed the finish line, gunshots were fired outside the track's fountain admission gate, according to numerous reports.
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The sheriff's office said the suspect was "down" and had been taken to hospital.
His condition was not immediately available.
The racetrack, at Del Mar Fairgrounds, is located about 21 miles north of downtown San Diego along the Pacific coast. The man pulled out a silver plated semi-automatic handgun and fired several shots into a crowded area.
Many concert goers left following the shooting, but Ice Cube went on as scheduled. TVG documented the shooting while calling a race with a broadcaster repeatedly saying: "There is gunfire at the track".
"We take consolation in the fact that no patrons, officers or security personnel were injured in the incident", the statement said.