(Mosier, OR)  --  Police are searching for a suspect accused of opening fire on a group of swimmers and kayakers in the Columbia River.  Police say the group was triathlon training between Mosier and Hood River near Eighteen Mile Island Sunday morning when someone started shooting at them.  One of the kayakers tells KATU she heard about 20 bullets hit the water.  No one was injured.  Police say it's not yet clear whether the shots were intentional or just the result of irresponsible shooting.