(Portland, OR)  --  Police are releasing the identity of the student accused of bringing a shotgun to Parkrose High School.  The Portland Police Bureau says they arrested 18-year-old Parkrose student Angel Granados Dias for the incident Friday.  Friends of Dias tell KATU-2 they're shaken by the incident, adding that Dias had been struggling with some depression and that he's "a decent guy deep down."  Witnesses say Dias appeared in the doorway of a government class on Friday wearing a black trench coat and holding a shotgun.  A security guard tackled him to the ground before any shots were fired.  No injuries were reported.