(Portland, OR)  --  A Portland massage therapist is facing charges after being accused of sexually abusing a client.  Thirty-two-year-old Benjamin Thomas Collura was arrested this week as a result of an investigation that began in February.  Authorities say a 31-year-old woman told police she was assaulted by Collura at River's Edge Hotel and Spa.  Investigators say they're checking into whether there are other victims.