(Portland, OR)  --  Police are searching for a man accused of stabbing another man at a park between Beaverton and Tigard.  Police say two men with skateboards were sitting on a bench along the Barrows Park trail Friday night when a man walked by with his dog.  The two men reportedly made comments to the man with the dog, prompting an argument in which the man with the dog allegedly pulled out a knife and stabbed one of the skaters in the leg.  The other skater allegedly struck back at the man's head with his skateboard.