The killings of two unarmed black men by white police officers in Missouri and in New York this summer touched off protests and a national debate over police conduct that intensified after grand juries declined to indict the officers.
Tensions escalated further after two New York Police Department officers were killed Dec. 20 by a man who suggested in online posts their slayings were in retaliation for the deaths of Michael Brown in Ferguson, Missouri, a St. Louis suburb, and of Eric Garner in New York. The gunman, who was black, committed suicide.
Some key developments amid the tension between police and communities:
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