Maybe because of the insufficient information one wonders the why. "This is to advise you that law enforcement agencies are investigating threats of violence against the PSU community made by Henry Liu, a graduate student at Portland State University."
Let's hope that PSU made a considered review of federal law before it issued the email. We are not informed in the notice or in the originating KGW news story what the threats were or what federal law required the notice. Without more the public will be correct in regarding Mr. Liu as a dangerous individual. Or was he just disgruntled?