A shooting at a festival in Seattle has left three people dead and one 15-year-old in custody, according to police reports. Authorities believe a shootout occurred between two individuals at the event, resulting in the fatalities. The apprehended teenager is currently being investigated for their involvement in the incident. However, police have stated that a second suspect remains at large and efforts to locate them are ongoing. The motive for the shooting is currently unknown, and the investigation is actively underway. This incident has shocked the Seattle community and raised concerns about security at public gatherings. Further details will be released as the investigation progresses.