(Hillsboro, OR)  --  A Bay City man has been arrested on accusations of child sex abuse and detectives are concerned there might be more victims.  Four children have reported they were abused by 39-year-old Jacob Bentley when they were under ten years old.  He has lived in Hillsboro, Cornelius, Forest Grove and Bay City.  A Washington County grand jury has indicted Bentley on 12 counts of sexual abuse and two counts of using a child in display of sexually explicit conduct.