https://youtu.be/VumHPXdleSw
https://www.youtube.com/watch?v=L7VwDMjW-uA
https://nypost.com/2018/02/28/high-school-placed-on-lockdown-after-false-gun-threat/
https://www.youtube.com/watch?v=Galpn_Uts6w
https://www.bbc.com/news/world-latin-america-13003419
https://www.youtube.com/watch?v=AgMA8QS0kAo
https://www.youtube.com/watch?v=akgtLtVUgUg
https://www.washingtonpost.com/news/post-nation/wp/2018/04/21/a-florida-school-shooting-suspect-charged-with-terrorism-says-sorry-to-injured-student/?noredirect=on&utm_term=.fb6a62a0d0d2
https://www.youtube.com/watch?v=Ef9Ff-nB6dw
https://www.youtube.com/watch?v=WG6d3E3xUQY
https://www.reddit.com/r/videos/comments/2p4fgv/high_school_administrators_mistake_intruder_for/
http://www.maplevalleyreporter.com/news/handcuffed-suspect-mistaken-for-student-video/
https://www.youtube.com/watch?v=OjL9OB-hXvE
https://www.youtube.com/watch?v=ZJVE-FxUKBs
http://www.sandiegouniontribune.com/sdut-serra-high-school-lockdown-2012sep14-story.html
https://www.youtube.com/watch?v=VLWC0rkO1_g
https://www.youtube.com/watch?v=33P_4TAIn-E
https://www.youtube.com/watch?v=tMA-eFTQlQ4
https://www.dailystar.co.uk/news/latest-news/647751/School-stabbing-The-Swinton-High-School-arrest-Pendlebury-Manchester
https://www.youtube.com/watch?v=FncKdCzEslU
https://en.wikipedia.org/wiki/Stoneman_Douglas_High_School_shooting
https://youtu.be/K5fF2y13Or4