The Discovery Of A Black Box Chained To A Utility Pole Near The Gate City High School Football Stadium Prompted A School Lockdown For Almost Two Hours Today. It Turned Out The Box Was A Traffic Monitoring Device Installed By Gate City Police. Students Were Prohibited From Leaving The Building From 11:15 Am Until 12:45 Pm. A School Administrator Said They Wanted To Take Every Precaution Because Of All The Online Threats Of Violence In Schools Today Due To Today Being The Anniversary Of The 9/11 Terrorists Attack.