Peshmerga discovered 'six gas canisters ' on truck in suicide bomb attack . Troops there were treated for 'dizziness , vomiting and general weakness ' Analysis of soil and clothing revealed chlorine , Kurdish authorities claim . Footage showed white smoke coming from the truck as it was fired upon . Chlorine is a hazardous gas that chokes victims and can result in death .
Peshmerga discovered '20 gas canisters ' on truck in suicide bomb attack . Troops there were treated for 'dizziness , vomiting and general weakness ' Analysis of soil and clothing revealed chlorine , Kurdish authorities claim . Footage showed white smoke coming from the truck as it was fired upon . Chlorine is a hazardous gas that chokes victims and can result in death .