A styrene gas leak in Visakhapatnam, India has killed 11 people and left thousands injured:

Vizag gas leak: Death toll mounts to 11

The incident led to panic among locals in the 3km-radius area. Many people were seen lying unconscious on roads while some faced breathing difficulties. People also complained of rashes on their body and soar eyes.

This event echoes back to the Union Carbine incident in Bhopal, India in 1984 which killed over 3,000 people.

There are thousands of large chemical manufacturing plants around the world, as well as millions of tons of toxic materials being transported every day. The Chemical Attacks chapter of the book covers these kinds of incidents as well as chemical attacks launched by terrorists.