Seattle shooting latest: 15-year-old arrested after gunfire erupts at food festival, leaving 3 dead, 4 injured; 1 suspect still at-large

Gunfire erupted at a food festival in Seattle on Sunday, leaving three people dead and four others injured, including a toddler.A 15-year-old was detained and booked in connection with the shooting and will make their first court appearance Monday afternoon, Seattle Mayor Katie Wilson said during a news conference on Monday. Authorities had initially said the incident involved two people shooting at each other, but in court documents viewed by the Associated Press and Seattle Times, police now say they believe a third shooter, who was killed in the shootout, was involved."Investigators believe [the 15-year-old] and one of the deceased engaged in a gunfight with at least one other unknown suspect," the document said.A 15-year-old was detained and booked in connection with the shooting and w