Whoever authorised these attempted murders were worse than amateurish by leaving such an attributable "calling card" at the scene of the crime. Or was it left deliberately, in order to point a finger?
Jill Dando's assassin never left such blatant clues - and he has never been identified. https://en.wikipedia.org/wiki/Jill_Dando
Just a question for UK folks: one of the two policemen who first attended the scene (and was also infected) was a Detective Sergeant. Surely uniformed beat cops would have been sent to a situation where persons appeared ill in a public place? I've never heard of detectives being first responders to such a scenario. Unusual to say the least.
Adds to the conspiracy theories I suppose.