Colonel Ryan Dillon, a spokesman for the Operation Inherent Resolve, said on Friday that US-led coalition forces have uncovered and destroyed chemical weapons that were in the hands of Islamic State.
Mr Dillon said: “We have seen a nascent and ineffective use of chemical weapons by ISIS in both Iraq and in Syria.
“We have found them and we have gone after them and ripped them apart.”
This comes after researchers and analysts recorded dozens of instances where ISIS has used chemical weapons in both Iraq and Syria.
Speaking from Baghdad, the colonel added: “We have found in a couple different instances mortars or RPGs, rocket-propelled grenades, with some type of chemical that has been used in an attempt to use those as chemical weapons.”
Adding that the coalition forces also found masses of chemical material that could be used when mixed together.
Mr Dillon said the coalition has continued to dismantle ISIS’ capabilities after the terror groups’ strong-hold, Raqqa, was liberated last Tuesday when US-backed forces declared victory in the Syrian city.
The spokesman stated: “We’ve been ripping apart their ability to do these things, whether that’s chemical, whether that’s their drone networks, whether that’s their ability to use their propaganda arm, their ability to finance, resource, conduct external operations.
“We’ve absolutely torn apart those networks and we’re continuing to do that.”
It comes as experts from the United Nations and a chemical weapons watchdog issued a report on Thursday accusing the Syrian government of executing a sarin nerve gas attack in Khan Sheikhoun in April that killed more than 90 people.
The Syrian government denies carrying out the attack.
Meanwhile, earlier this week a UK international development minister said Britons who fought for so-called Islamic State in Syria will have to be killed in almost every instance.
Rory Stewart said members of the terror group supported an “extremely hateful doctrine” and that fighters should expect to die, given the threat they pose to British security.
Describing the “very difficult moral issues” involved, he said: “These are people who have essentially moved away from any kind of allegiance towards the British Government.
“They are absolutely dedicated, as members of the Islamic State, towards the creation of a caliphate.
“They believe in an extremely hateful doctrine, which involves killing themselves, killing others and trying to use violence and brutality to create an eighth-century state.
“So, I’m afraid we have to be serious about the fact these people are a serious danger to us, and unfortunately the only way of dealing with them will be, in almost every case, to kill them.”
The British authorities said approximately 850 people from the UK have travelled to support or fight for jihadist groups in Syria and Iraq, the British authorities have said.