(Portland, OR)  --  Police say they've arrested one suspect and are searching for two more in connection to an armed carjacking in northeast Portland that left a man hospitalized.  Police say three people approached the victim at his motor home on Northeast Beech Street Saturday night and pistol-whipped him before sealing several items, including his SUV.  Police arrested 39-year-old Shirene Singh after spotting the stolen SUV moments later.  Police are still searching for two other suspects.