(Portland, OR)  --  An investigation is ongoing into a stabbing at a convenience store in Vancouver.  Police responded to the AM/PM on Northeast Andresen Road early yesterday on reports of a fight.  Police say officers arrived to find several people still fighting.  One man was taken to a hospital with life-threatening stab wounds.  Police say a K-9 unit tracked down the stabbing suspect 24-year-old Charson Lotius in some bushes nearby.  He was arrested on charges of first-degree attempted murder and second-degree assault.