ISIS Ramping Up Chemical Weapons Use Against US Troops In Mosul Analysis/DigitalGlobe/Handout via REUTERS

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Saagar Enjeti White House Correspondent
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U.S. officials expect Islamic State chemical weapons attacks to increase as Iraqi troops advance on the city of Mosul, Reuters reports.

U.S. forces confirmed ISIS used Mustard Gas shells as recently as Oct. 5 against local troops. ISIS also launched chemical weapons at a U.S. base in Iraq in late September. U.S. officials stressed at the time that the mustard gas agent was “ineffective,” of “low purity,” and “poorly weaponized.”

While ISIS’s chemical weapons capability remains nascent, sulfur mustard gas shells can still cause blistering on exposed skin and lungs, if inhaled.

“Given ISIL’s reprehensible behavior and flagrant disregard for international standards and norms, this event is not surprising,” a U.S. defense official told Reuters.

Approximately 100 U.S. special operators are embedded with the nearly 100,000 troops currently advancing on Mosul. The Pentagon insists these forces are advising and assisting Iraqi forces, and will not engage in direct combat against ISIS. U.S. Navy Seal Charles Keating was killed in May in a similar advise and assist mission in Iraq, when the Kurdish unit he was attached to came under heavy fire from ISIS militants.

The U.S. has approximately 5,000 U.S. troops in Iraq, with the majority serving in advisory or support roles who remain on base. The role does not keep them from harm’s way, rocket fire killed a Marine on a base in northern Iraq in late March.

The general in charge of overseeing the Mosul operation told reporters Wednesday he expects ISIS “to go into insurgency mode.” He continued that the U.S. expects ISIS to mount high profile suicide attacks on civilians after they lose Mosul. A vigorous ISIS insurgency runs the risk of being able to take territory back if the Iraqi government does not stabilize Mosul.

“The challenge of Mosul and Nineveh is the considerable number of ethnic groups, religious sects, tribes and other elements that make up the province,” Retired U.S. Army General David Petraeus warned in The Washington Post in August. Patraeus said the biggest challenge in Iraq is not the defeat of ISIS, but ensuring “post-conflict security, reconstruction and, above all, governance that is representative of and responsive to the people.”

He declared, “Failure to do so could lead to ISIS 3.0.”

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