India, July 28 -- Police now say there were at least three suspects involved in a food festival shooting near Seattle's Space Needle over the weekend, and that 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 was making an initial appearance Monday, police said they believe there were at least three shooters: 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 teen was being held in juvenile detention for investig...