FILE PHOTO: The skyline of Dallas is lit up in blue, the traditional color of police uniforms, following the multiple police shootings in Dallas, Texas, U.S., July 10, 2016. Picture taken July 10, 2016. REUTERS/Carlo Allegri
FILE PHOTO: The skyline of Dallas is lit up in blue, the traditional color of police uniforms, following the multiple police shootings in Dallas, Texas, U.S., July 10, 2016. Picture taken July 10, 2016. REUTERS/Carlo Allegri