The use of a robot by Dallas police to kill a gunman after he'd shot a number of police officers appears to have been the first time U.S. law enforcement intentionally used a robot lethally, experts said. Dallas officials said Friday that officers decided to use a bomb-disposal robot jury-rigged with C-4 explosives after negotiating with the suspect for several hours and then exchanging gunfire with him.

The Dallas police's use of a robot to kill a man suspected of shooting police officers may have been the first time U.S. law enforcement intentionally used a robot lethally, two security researchers said Friday. Dallas Police Chief David Brown said Friday that officers decided to use a bomb-disposal robot jury-rigged with explosives after negotiating with the suspect for several hours and then exchanging gunfire with him.