Notify your Administration to investigate the threat. That's their job and Administration should have a protocol ( ie, they investigate, notify the Superintendent's office & local police, etc.)
I am wondering if anyone has created a protocol for their district that deals with threats made via social media? This would be a student or individual stating threatening things via facebook or other social media outlets that are worrisome for school safety.
New Hampshire School Nurses' Association
www.nhschoolnurses.org email: firstname.lastname@example.org