Officials warn of potential for copycat attacks

 https://apnews.com/article/trump-attempted-assassination-iran-threat-secret-service-87f9a1e6e74c2ac18636334e9b2e03a3

The Copycat_effect is always a potential looming in the background.

https://copycateffect.blogspot.com/search?q=Thomas+Matthew+Crooks

https://archive.org/details/copycateffect00lore

https://www.sciencedirect.com/science/article/abs/pii/S1359178915000336

https://books.google.ca/books/about/The_Copycat_Effect.html?id=3B4lTTZE58oC&redir_esc=y

https://daily.jstor.org/psychology-copycat-crime

https://nypost.com/tag/thomas-matthew-crooks/

https://thedigitallabyrinth.blogspot.com/search?q=Thomas+Matthew+Crooks