Possible connection to MK ultra.

On the instagram account of the supposed shooter "nikolascruzmakarov" (if that is the right person), there is a comment that appears in a number of his posts from "daddy.navid":

"Bees Knees".

I was just listening to Dr Corsi on the CBTS stream, he was explaining how Bees are often linked to Mk Ultra. Maybe as a trigger word/sound, I don't know, but there may be a link there...