(Eugene, OR)  --  Police are releasing new details regarding a shooting that injured one person at the Lane County Fair over the weekend.  The Eugene Police Department says a 16-year-old boy fired a single gunshot Saturday during an altercation involving several other teens and one adult.  A security guard tells KATU-2 the 16-year-old and several of his friends were arguing with an older man near a stage when things turned physical and the 16-year-old threatened to shoot the man.  The guard says he stepped in and tackled the teen to the ground, and that's when the gun went off, striking a woman nearby.  She was taken to a hospital with non-life-threatening injuries.  Police arrested the 16-year-old as well as a 14-year-old for disorderly conduct.