An eyewitness video that aired on Dallas' KDFW-TV appears to show a gunman outflanking and shooting a police officer during the sniper attack Thursday.
The footage shows a man with a rifle standing on the sidewalk, hiding behind a pillar. As another person, apparently a police officer, approaches from behind and hides behind a separate pillar, the gunman turns around and runs toward the officer's pillar, then apparently shoots the officer in the back at close range.
The officer fell to the ground.