the arizona department of corrections spent more than $2,000 to purchase ingredients to make cyanide the deadly gas. a simple mechanical combination of granulated potassium cyanide with sulfuric acid causes a violent chemical reaction, the product of which is hydrogen cyanide, a poisonous gas that stops cellular respiration. it was first used as a pesticide in california in the late 19th century to control pests. then they used it to treat the clothes of mexican migrants. the german chemical industry improved the substance under the brand name cyclone b, it began to be used for mass executions in nazi death camps, that is, in gas chambers. valentin bogdanov, ivan udkin and denis lisitsin, vesti nedeli, usa. the russian ministry of defense has distributed footage of the combat operation of the geocent s self-propelled gun of the west group of troops. shot! in the kupinsky direction, artillerymen carry out precise strikes around the clock on military targets, armored vehicles and enemy personnel. objective control footage received from the uav in real time allows you to verify the dest