(Reuters) – Police in Portland, Oregon, said they believe a shooting that left one woman dead and five people wounded at a protest over police violence on Saturday night was triggered by a clash between an armed homeowner and armed demonstrators. The shooting took place as people gathered in northeast Portland on Saturday to protest the death of Amir Locke, the 22-year-old fatally shot earlier this month by law enforcement in Minneapolis during a no-knock apartment raid. The Portland Police Bureau said in a statement on Sunday that a preliminary investigation indicated the incident “started wi…