Chicago police say a fight at the annual fireworks show at Navy Pier caused panic that injured more than a dozen people. Chicago police spokesman Anthony Guglielmi says three people were stabbed during a fight that followed the Fourth of July display, which draws thousands of people to the Lake Michigan shoreline each year, the AP reports. Guglielmi says 16 others were taken to hospitals after being trampled during the rush of people fleeing the scene. He says somebody apparently yelled "gun" or "shots fired," causing a "stampede." Police say there was no evidence of shots being fired, and a person initially thought to have been shot actually had a puncture wound from an overturned table, reports the Chicago Tribune.