Oakland protesters set fire to courthouse, smash windows
A protest in Oakland, California, in support of racial justice and police reform turned violent when a small group of demonstrators wearing helmets and goggles and carrying large signs that doubled as shields set fire to a courthouse, vandalized a police station and shot fireworks at officers, authorities said.
http://apnews.com/80145dc4942501c55a3cd5f939245a31
...sounds like it was pre-meditated to me.

Liberals are like a "Slinky". Totally useless, but somehow ya can't help but smile when you see one tumble down a flight of stairs!