You're jumping to conclusions way too fast.
Given that the snipers are only shooting police officers, and the shooting happened at a BLM rally, where people were giving speeches saying things like "We are targets! We made it to freedom and you're still killing us. You're still hanging us from trees" as quoted in the CNN article, it's a pretty obvious conclusion.
Ugh, here we go, I was hoping we could at least wait until the bodies are cold until people start pointing fingers.
Since when do we wait "until the bodies are cold" before condemning those responsible for a massacre?
If it turns out this was just an enormous coincidence and the two snipers had nothing to do with Black Lives Matter at all, I will retract all my posts and apologize. But I think it's evident enough what happened that there's no need to wait around for a final confirmation.