Robot-delivered lethal explosive in Dallas police standoff was a first, experts say

Members of the Boston Police bomb squad demonstrate a robot named "Slick" during an active shooter drill at Fenway Park in Boston, Massachusetts, U.S. June 12, 2016. Experts say Dallas police executed an unprecedented move Friday morning, when officers used a robot-delivered bomb to engage a suspect accused of fatally shooting five police officers and injuring seven others during a protest. The shooting started toward the end of a non-violent protest over recent fatal police shootings. Police engaged in a standoff with the suspect, who was later identified as Micah Xavier Johnson, after he barricaded himself inside a parking garage. Following lengthy negotiations with the police, Johnson told officers he had planted bombs in the area.