There have been allegations of chemical weapons being delivered as barrel bombs , specifically the 11 April 2014 Kafr Zita chemical attack which saw the use of chlorine gas . Within days of the attack , analysts said they were moving towards a belief that there is " a coordinated chlorine campaign with growing evidence that it is the government side dropping the bombs "
Kafr Zita chemical attack
2014 Kafr Zita chemical attack
Barrel bomb