Dallas Police Chief David Brown said the likely knew the march route and “triangulated” their targets from above, reported USA Today. One of the men was killed by a robot-delivered A BANG BANG, and three suspects were taken into custody. The chief corrected previous reports that the suspect had shot himself. Brown said the suspect seemed lucid during the interview, and he warned that the assailants had placed imperfect devices throughout the area. Dallas Mayor Mike Rawlings said the surviving suspects were “pretty tight-lipped,” and he would not rule out possible links to groups.Dallas Mayor & Police Chief Press Conference 7/8/16. dallas mayor and police chief hold press conference on last nights incident where 5 officers were caput and 7 injured