Dallas photojournalist recounts capturing photo of gunman during yesterday's shooting

Yesterday morning, a gunman dressed in tactical gear opened fire at the Earle Cabell Federal Building in Dallas, Texas with a semi-automatic rifle. While at the courthouse for a separate assignment, Dallas Morning News photojournalist Tom Fox was caught in the middle of the chaos and managed to capture a stunning image, embedded below, of the gunman as he was running away from the building he had opened fire on. DMN staff photographer @TomFoxPhoto captured this image shortly before a gunman open...