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“Weaponized vesicants, nerve agents and toxic industrial compounds are suspected to have been considered under the program.”

Trying to insert central lines and then have vesicant drugs infiltrate into tissues is torture.

A chemical weapons expert told HRW the attacks caused painful burns to at least seven people, consistent with exposure to low levels of a chemical warfare agent known as 'vesicants', or blister agents.

Two independent chemical weapons experts agreed the injuries seen were consistent with a chemical attack, with symptoms pointing to vesicant or blister agents.

But soon all sides had turned to gases which maimed even soldiers wearing a mask - blistering agents, or "vesicants".