It was used most recently in an attack during the Syrian civil war, with up to 1,800 people killed.
The shocking claim was made by Ahmed Gaddaf al-Dam, Colonel Gaddafi's cousin.
Mr Gaddaf al-Dam also warned that ISIS could spark a global "catastrophe" and "nobody will be spared" if the West does not follow Russia in propping up Syrian president Bashar al-Assad.
The former Syrian intelligence official said European countries would be powerless to stop "suicide bombers from hell" and the flow of oil through the Suez Canal would be blocked.
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