(Portland, OR)  --  Police are searching for two men accused of pistol-whipping a teenager while robbing him and his friends at a public pool.  It happened just after midnight yesterday at the Creston Outdoor Pool in southeast Portland.  Police say the teen was swimming with friends when two men walked up and went through their belongings.  The teen confronted the men, prompting one of them to allegedly hit him with his gun.  Both suspects then fled on foot.  Anyone with information is urged to contact police.