CNN is reporting that ISIS forces have launched a chemical weapons attack against U.S. and Iraqi forces. A shell containing mustard gas reportedly landed near Qayarrah air base. Blessedly, no American forces were injured in the attack. U.S. officials are describing the shell as poorly weaponized and ineffective:

No US troops were hurt 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."

A US defense official said troops had gone out to look at the ordnance after it landed. Based on seeing what they thought was a suspect substance, two field tests were conducted.