Crime scene tape blocked off an area of downtown Springfield on Fountain Avenue near the Esplanade for about an hour near the Holiday in the City events.
Initial emergency radio reports indicated a man had been shot in the arm in the parking lot of the Clark County Heritage Center about 8 p.m.
Most Holiday in the City festivities were ending around that time.
“Officers are continuing to gather information at this time, and our investigation is very fluid,” Springfield Police Chief Lee Graf said in the release. “The safety of all those in our community is our top priority, and we take that to heart in all we do.”
No suspect information was available Friday evening, the city said.