NYC gunman issued warning moments before killing two NYPD officers
Amateur video captured the frantic scene as paramedics desperately tried to save the lives of officers Wenjian Liu and Rafael..
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NY Mayor: "Our city is in mourning" after NYPD officers killed
At a news conference Saturday, Mayor Bill de Blasio said the "execution-style" killings of two NYPD officers was an attack on the..
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