(Portland, OR)  --  A string of bar robberies in Portland in the last week and a half have police investigating.  The Blue Fin Bar and Grill on Sandy Boulevard and The Lodge Bar on Southeast Powell Boulevard were both robbed Saturday night.  Two other robberies also occurred at the Jolly Roger bar on Southeast 12th Avenue and another at Lotsa Luck Bar and Grill on Southeast Powell Boulevard.  Police haven't said if the robberies are connected.