article_snippet: There is evidence to prove that ISIS is using chlorine gas as a chemical weapon in ISIS battle against peshmerga forces in Iraq, Kurdish authorities have claimed.
article_snippet: Biological warfare: Kurdish authorities claim the 20 gas canisters found on board a truck involved in a suicide bomb attack in Iraq (pictured) is further proof of ISIS using chlorine as a chemical weapon .
article_snippet: Traces of chlorine were discovered after samples of clothing and soil from the site were analysed, the Kurds claim.
article_snippet: There have been several previous allegations that Islamic State terrorists have already used weaponised chlorine.
article_snippet: In October, Iraqi officials claimed ISIS could have used chlorine-filled cylinders during clashes in the towns of Balad and Duluiya.
article_snippet: And reports from the Syrian border-town of Kobani suggested the extremist group added chlorine to an arsenal that already included heavy weapons and tanks looted from captured military bases.
article_snippet: Evidence: Analysis of clothing and soil samples from the scene revealed traces of chlorine, Kurdish authorities claim .
article_snippet: Jennifer Cole, Senior Research Fellow at defence think-tank Royal United Services Institute, told MailOnline that although chlorine can be lethal, it does appear that it's being used to spread fear by ISIS.
article_snippet: During the Syrian civil war, a chlorine gas attack on the outskirts of Damascus in 2013 killed hundreds and nearly inspired the US to launch airstrikes against the government .
article_snippet: The Americans and the West accused President Bashar Al-Assad's regime for a chlorine gas attack on the outskirts of Damascus in 2013, while Damascus blamed the rebels.
article_snippet: Even Al-Qaeda in Iraq - the militant group that eventually became ISIS - used chlorine gas in a suicide attack in May 2007.