Updated 2:05 pm.
More than a dozen people were hurt at Chicago’s Navy Pier Thursday night in a fight and, separately, a stampede after false reports of gunfire.
The incidents occurred after 10 p.m. following the popular annual fireworks that draw thousands to the pier.
Police said a brawl broke out when a group flashed gang signs. Two juveniles were stabbed, and an adult who was not part of the fight was inadvertently stabbed, said Chicago Police News Affairs spokeswoman Sally Bown. All the injuries were not life-threatening.
Police said the fight and stabbings occurred outside a security perimeter where people had been screened before entering the pier earlier in the night.
Bown said no arrests had been made as of Friday morning.
Chicago police say the stampede was caused by a private security officer who issued a false active shooter alert.
The security guard told people to take shelter, resulting in chaos that injured more than a dozen people. Police Sgt. Rocco Alioto said 14 people were taken to hospitals with non-life-threatening injuries after being trampled. He said there had been no gunshots.
Police at a briefing on Friday said the guard mistook a firecracker set off in the crowd for gunfire. This happened after the three people were stabbed.
Chicago Police Supt. Eddie Johnson did not blame the security guard for the decision.
But he said the police department will be in touch with Navy Pier to talk through their safety protocols.