Two NYPD officers were shot and killed in their car by a gunman who was disgruntled about the Eric Garner and Michael Brown cases; the shooter subsequently shot himself on a subway platform.
NY Times article -
http://www.nytimes.com/2014/12/21/nyreg ... pe=article
CNN news report -
http://www.worldstarhiphop.com/videos/v ... nU9UOSN03h