I was surprised to learn that by US Law a grenade is considered a WMD. Which is not what I thought of when I hear the term Weapon of Mass Destruction.

https://www.fbi.gov/investigate/wmd

A WMD is defined by U.S. law as any of the following:

* A destructive device, such as an explosive or incendiary bomb, rocket, or grenade;

* A weapon that is designed to cause death or serious injury through toxic or poisonous chemicals;

* A weapon that contains a biological agent or toxin; or

* A weapon that is designed to release dangerous levels of radiation or radioactivity.