Police officers executed
Crime scene technicians examine the squad car in which New York Police Department officers Rafael Ramos and Wenjian Liu were shot and killed in by Ismaaiyl Brinsley fired in the Bedford-Stuyvesant section of Brooklyn, N.Y., on Saturday, Dec. 20, 2014. Hours earlier, Brinsley shot his girlfriend in Baltimore and boasted in social media about wanting to kill cops. Both officers later died at Woodhull Hospital.