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.

From then on, poison gas in a variety of forms was used extensively by both sides.

Traces of the World War One poison gas phosgene were detected in an incident at Sweden's security service HQ last Friday, official documents suggest.