(Portland, OR)  --  Police say a two-year-old boy who had vanished but was later found behind a bush two blocks from his home in Northeast Portland is now in protective custody.  Officials say it's likely the toddler, River, got out of the home sometime early Saturday morning through an unlocked door.  Police officers and a K-9 unit spent several hours searching before finding the toddler, who was then taken to a hospital for treatment of minor injuries and exposure to the cold.  A court hearing is slated for tomorrow on the case.