(Portland, OR)  --  Portland police are reporting that four people were wounded in a shooting in Southeast Portland.  Authorities say the shooting, which is believed to be gang-related, happened Saturday during a birthday party at the Rosewood Community Center on Southeast Stark Street.  Police say the wounded include a 15-year-old girl, a 17-year-old boy, a 19-year-old man, and a 20-year-old man.  All are expected to survive.  No arrests have been made.