ISIS is using WMDs that the left said didn't exist in Iraq.

The U.S. believes ISIS, also known as ISIL, most likely used either mortar or rocket shells to deliver the chemical warfare agent. One official said those who fell ill had symptoms of breathing problems believed to be associated with mustard gas and not chlorine gas, which is another agent that its believed the Assad regime has used on its civilians in Syria.
Democratic Rep. Adam Schiff of California, ranking member of the House Permanent Select Committee on Intelligence, told CNN's Wolf Blitzer, "If they do possess these kind of weapons ... my guess is they're more likely to have gotten them as old weapons left over in Iraq from the old WMD program there than they were likely to obtain them in Syria in some kind of a hidden cache of the regime's."
A U.S. official said ISIS had used chlorine in the past, but that it is hard to weaponize.
The major question for the U.S. intelligence community now is to determine exactly what happened, and if it is mustard gas, to try to figure out how ISIS came into possession of it. Officials tell CNN it may have come from old chemical weapons caches in Iraq or Syria that the U.S. does not know about.
It's also not known how much of the agent ISIS may have.
"Did ISIS find some mustard gas shells?" one official asked. "We think they did. We think they have used it."
U.S. investigating 'credible' reports that ISIS used chemical weapons - CNNPolitics.com
Democratic Rep. Adam Schiff of California, ranking member of the House Permanent Select Committee on Intelligence, told CNN's Wolf Blitzer, "If they do possess these kind of weapons ... my guess is they're more likely to have gotten them as old weapons left over in Iraq from the old WMD program there than they were likely to obtain them in Syria in some kind of a hidden cache of the regime's."
A U.S. official said ISIS had used chlorine in the past, but that it is hard to weaponize.
The major question for the U.S. intelligence community now is to determine exactly what happened, and if it is mustard gas, to try to figure out how ISIS came into possession of it. Officials tell CNN it may have come from old chemical weapons caches in Iraq or Syria that the U.S. does not know about.
It's also not known how much of the agent ISIS may have.
"Did ISIS find some mustard gas shells?" one official asked. "We think they did. We think they have used it."
U.S. investigating 'credible' reports that ISIS used chemical weapons - CNNPolitics.com