article_snippet: (CNN)Two police officers shot and wounded while standing guard outside the Ferguson, Missouri, Police Department early Thursday were deliberately targeted in what a police official called an "ambush.
article_snippet: The shootings were a chilling low point in the protests in the St. Louis suburb since a Ferguson police officer shot and killed 18-year-old Michael Brown in August.
article_snippet: The shootings were out again late Wednesday -- in response to the announcement hours earlier of Ferguson Police Chief Thomas Jackson's resignation -- when shots rang out from a hill about 125 yards from where the protesters had gathered, according to witnesses.
article_snippet: The officers -- one shot in the face, the other in the shoulder -- have been released from the hospital.
article_snippet: That angry rhetoric isn't confined to the case of Ferguson -- or of Staten Island, New York, where the death of Eric Garner in July after police attempted to subdue him spurred national protests and preceded the slayings of Liu and Ramos, said Groeninger.
article_snippet: In Jersey City, New Jersey, in July, police said a man assaulted a Walgreen's security guard and took a man gun in order to carry out the ambush-style killing of an officer, according to the Jersey Journal.
article_snippet: Two Pennsylvania State Police troopers were ambushed and shot outside police barracks in Blooming Grove in September.
article_snippet: This week, Wisconsin residents took to the streets to protest the police killing of Tony Robinson, a 19-year-old who was unarmed.
article_snippet: Robinson's shooting was the fourth involving an officer in Wisconsin in the last three weeks.
highlights_snippet: Two police officers are shot and wounded in Ferguson, Missouri, in what a police official calls an "ambush"
  Firearms killed 50 officers in 2014, up from 32 in 2013, the Officers Memorial Fund says .
  