Police arrested a 15-year-old after a festival shooting that killed 3 near Seattle’s Space Needle

The teen was being held in juvenile detention for investigation of firearms violations and first-degree assault and was due to appear in court Monday afternoon, Mayor Katie Wilson said at a news conference.

Authorities said Monday they are still looking for a second suspect, but could not rule out whether the second suspect was among those killed.

“We are trying to identify who that person is,” said Seattle Police Chief Shon Barnes. Police did not have a description of the potential outstanding suspect.

Investigators believe the two individuals were shooting at each other. Police said late Sunday night it was not clear whether any of the victims had been involved in the confrontation between the two shooters.

Two people died at the scene and a third died at a hospital. They were described as two men, ages 19 and 44, and a woman, 56.

The four wounded included a 2-year-old boy, who was in satisfactory condition Monday. The others — two men, ages 23 and 27, and a woman, 39 — were discharged, a hospital spokesperson said.

Vendors who had abandoned their food booths were cleaning up Monday. A candlelight vigil was planned Monday night at the center’s International Fountain.

The gunfire erupted around 6 p.m. Sunday in the waning hours of the Bite of Seattle. The annual three-day festival draws hundreds of food and retail vendors and performers to Seattle Center, a sprawling park and event space in the shadow of the Space Needle. Many attendees rushed into campus buildings or ran from the park at the sound of the shots.

Dozens of officers were providing security at the event and some saw one of the suspects firing, authorities said. A large number of police and emergency crews responded and began evacuating the area. Police then searched an IMAX theater on the grounds where they initially believed a second shooter had fled.

Festival attendee Faith Adia Hunter said she and her friends had just gotten food from a crepe vendor when gunfire broke out.

“We were about to start eating, then heard someone yell something, then we saw people start to run,” Hunter said. “So we took off running, too.”

“We were right next to him when it started, so we took off running,” Hunter added.

Hunter said that in the scramble to find safety, she and others ran into the nearby Seattle Children’s Museum.

Roberto Ramirez, a vendor at the event, said he heard what sounded like firecrackers before people began yelling “shooter” and frantically running.

“Suddenly everything was empty,” he said. “People were freaked out.”

After the initial panic, new guests continued to arrive, unaware of what had happened. Police told them to leave, he said.

Estan Wakonabo said he and his girlfriend were waiting in line for a photo booth when he was shoved from behind and turned to see a rush of people fleeing.

“People were hiding, were pushing, people were falling on the ground, baby strollers were falling,” Wakonabo said, adding that was when he heard gunshots.

“Once I heard a ‘pop, pop, pop,’ that’s when I knew it was a shooter,” he said.

After he escorted his girlfriend to safety, he returned to the scene to take photos and saw multiple victims on the ground, Wakonabo said.

The festival started in 1982 and draws 350,000 attendees, according to its website.