The video, credited to Randy Biart, shows a figure dressed in civilian attire carrying what appears to be rifle crouching behind pillars and firing shots. A second individual, wearing what looks like a police uniform, enters the screen and several shots are fired as the first person runs toward him.
[There was a video here]
After a moment, the second individual lies motionless on the ground and the first one flees.
According to Dallas Police, they have been exchanging gunfire with a suspect not currently in custody for 45 minutes. While the video has not been verified, it certainly appears to show a portion of that deadly shootout.