ISIS is suspected of firing a shell with a mustard agent that landed at the Qayarrah air base in Iraq, where US and Iraqi troops are operating, according to several US officials.

No US troops were hurt in the incident on Tuesday or have displayed symptoms of exposure to mustard agent. One official said the agent had "low purity" and was "poorly weaponized." A second official called it "ineffective.

The substance is being sent to a lab.

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