ISIS 'dead set' on using chemical weapons, US military official says

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(FoxNews.com) - A Pentagon spokesman said Monday that Islamic State militants are “dead set” on using chemical weapons and will likely try to use them against Iraqi forces as they prepare its siege on Mosul.

ISIS fighters are believed to have attacked U.S. and Iraqi forces with a “crude” chemical weapon, a U.S. official told Fox News last week. The U.S base outside Qayyarah, 25 miles south of Mosul, was struck by a rocket and traces of a "mustard agent" were believed to be present, the official said. The attack was first reported by CNN. No one was hurt in the attack.

"We fully recognize this is something that ISIL has done before. They've done it many times, at least a couple dozen that we know of where they have launched crude makeshift munitions that are filled with this mustard agent," Navy Capt. Jeff Davis told reporters.

According to Reuters, the U.S.-led coalition conducted an air strike on an ISIS chemical weapons factory Friday near Qayyara, the second attack on such a facility this month.

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