NBCNews: When a gunman charged and shot Philadelphia police officer Jesse Hartnett in his squad car earlier this month, the harrowing confrontation was disturbingly familiar.
Six police officers were killed by ambush shootings last year, while 15 ambushes took the lives of officers in 2014. The targeted killings present a risk to officers beyond more conventional threats, such as policing rough neighborhoods, adding another layer to the intense challenges police face. More here.
