Islamic State could have obtained the mustard agent in Syria, whose government admitted to having large quantities of the blistering agent
in 2013, when it agreed to give up its chemical weapons arsenal, the newspaper reported.
A blistering agent
which burns victims' skin, eyes, and lungs.
The country has hundreds of tons of various chemical agents, including sarin and VX nerve agents, as well as older blistering agents
such as mustard gas, dispersed in dozens of manufacturing and storage sites, experts say.
The United States manufactured thousands of tons of nerve gas, blistering agents
and other poisons, simply because the Soviet Union was known to be doing the same.
Vesicants are also known as blistering agents
because they irritate the skin, eyes, and lungs and may further affect other organs if absorbed into the body.