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In Ankara, Siegfried became co-director of a gas mask factory, a joint Turkish-German enterprise next door to a poison gas laboratory.

Auschwitz and the Holocaust didn't begin with poison gas.

Before we walk into a room, we like to be fairly certain of what we’ll find — walls, floor, furniture, not hot coals or clouds of poison gas.

The U.S. accused Russia of using chemical weapons, including poison gas, against Ukrainian forces.

The United States has accused Russia of using chemical weapons, including poison gas, “as a method of warfare” against Ukrainian forces, in violation of a global ban on the use of such weapons.