A group of people was attacked when somebody sprayed them with a caustic chemical of some sort, seven were injured and at least one person recieved second degree burns.
It's not the first time I warn of chemical weapons, my post concerning "works bombs" are toppers in terms of visits for some reason.
The average household is often overflowing with dangerous chemicals ... chemicals that are hardly controlled, and can be used rather well as weapons. A person bent on harming multiple people might very well do so by building a proper chemical weapon.
You cannot disarm psychopats, you can help them, or defend yourself against their attacks.