Once, okay it could have been an accident, but twice is starting to look like it might be deliberate.
http://www.zerohedge.com/news/2016-07-17/manhunt-under-way-after-least-3-police-officers-shot-baton-rouge-live-feed
Remarkable and passionate discussion about America's recent "police vs. blacks" controversy: http://www.rationalargumentator.com/index/blog/2015/07/handcuffed-and-helpless/