Islamic State (ISIS) jihadists are "dead set" on using chemical arms and are likely to try them again as Iraqi forces advance on Mosul, a Pentagon spokesman warned on Monday,Reuters reported.
The comments come days after ISIS jihadistsfired a shell containing mustard agent that landed at the Qayarrah air base in Iraq, where American and Iraqi troops are operating.
That incident followed several reported cases of ISIS using mustard agent in both Syria and Iraq. CIA chief John Brennan has warned that the jihadists have used chemical weapons and have the capability to make small quantities of chlorine and mustard gas.
The rocket fired last Tuesday landed in an unpopulated area near the base. No one was hurt in the attack.
The shell that was fired initially tested positive for a mustard agent, but two subsequent tests have been inconclusive and the device is undergoing further tests, Navy Captain Jeff Davis, a Pentagon spokesman, told reporters on Monday, according to Reuters. READ MORE