Helter Skelter?

"Sniper Fire In Dallas, Killing 5 Police Officers, Injuring 6 (Update 12)"

"Police Say Dallas Shooting Was Carried Out by at Least Four Snipers Strategically Positioned on Rooftops"

Given that American police are already at at an almost comical level of murderous rampage, with not a single American politician apparently able to anything about it, this should be enough to up the ante significantly.

"Helter Skelter (Manson scenario)"