Police now say there were at least three suspects involved in a shoot-out at a crowded food festival near Seattle’s Space Needle over the weekend. One of them was among those killed in the violence.In a document filed in juvenile court in Seattle, where a 15-year-old arrested in the case did not appear for a scheduled initial appearance on Monday, police said they believe there were at least three shooters, rather than two: the 15-year-old; an acquaintance who died at the scene; and “at least one other unknown suspect”.“Based on the evidence at the scene, 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.The teenager was being held in juvenile detention for investigation of firearms violations and first-degree assault ahead of the scheduled court appearance, Mayor Katie Wilson said at a news conference. It was not immediately clear why the teenager did not appear in court.The gunfire erupted at around 6pm on Sunday in the waning hours of the Bite of Seattle, leaving three people dead and at least four others injured. The annual three-day festival draws hundreds of food and retail vendors and performers to Seattle Centre, 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.News that there were at least three suspects followed a series of confused statements from city officials concerning the shooting.