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https://www.pbs.org/newshour/science/robot-delivered-lethal-explosive-in-dallas-police-standoff-was-a-first-experts-say https://www.pbs.org/newshour/science/robot-delivered-lethal-... https://en.wikipedia.org/wiki/2016_shooting_of_Dallas_police_officers#Standoff_and_shooter's_death https://en.wikipedia.org/wiki/2016_shooting_of_Dallas_police...