Iran's Foreign Minister Mohammad Javad Zarif has said that US accusations that Tehran has a chemical weapons programme were "obscene and dangerous".
The US allegations are the latest salvo against Iran from the administration of President Donald Trump, who earlier this year pulled out of a landmark 2015 nuclear deal between major powers and Tehran and reimposed crippling unilateral sanctions.
"(The) US wants to resort to international conventions to make allegations against Iran when it's made a policy of violating them itself," Zarif said in a tweet on Friday.
He said that allegations about weapons of mass destruction "by a country that supported Iraq's use of CW (chemical weapons) against Iran, then invaded Iraq to allegedly rid it of them is not just obscene, it's dangerous".
Earlier on Friday the Iranian foreign ministry said Tehran "strongly rejects" the US accusations.
"The United States... has made, as is its habit, baseless accusations against the Islamic republic which we strongly reject," the foreign ministry said in a statement.
"Such incorrect and false accusations are due solely to enmity towards the Iranian nation and are intended to deflect international attention from its own broken commitments and continued support for the Zionist regime's chemical arsenal and for terrorist groups."