The OP is asking for information about what took place, and showing some healthy skepticism about what's behind the events shown in the video. Let's not jump to conclusions, and let's not use this as an excuse to vent about police states, or otherwise indulge in cop-bashing.
I did a quick Google search and found no reports on this from legit news sources, so I too am skeptical at this point, and hoping for some actual facts.
"Once the writer in every individual comes to life (and that time is not far off), we are in for an age of universal deafness and lack of understanding."
(Milan Kundera, Book of Laughter and Forgetting, 1980)