"We condemn use of chemical weapons," Ali Akbar Salehi told Germany's Der Spiegel newsweekly in an interview published on Sunday.

On May 1, Syrian envoy to the United Nations, Bashar al-Jaafari, submitted documents that showed militants used chemical material on civilians during an attack on a city near country’s border with Turkey.

The US has been accusing the Syrian government of using chemical weapons against militants. However, on May 10, the UN Independent International Commission of Inquiry on Syria said that it had “strong, concrete suspicions” chemical weapons have been used by the militants in Syria.

Commission member Carla Del Ponte said that the UN investigators gathered testimony from people injured in the Syrian conflict and medical staff indicating that the militants had used the nerve agent sarin, which UN Resolution 687 classifies as a weapon of mass destruction.

Speaking on use of chemical weapons in the Syrian conflict, Iranian foreign minister said Iran was itself a victim of chemical warfare during its conflict with Iraq in the 1980s and Tehran is "categorically against all weapons of mass destruction".

Iran suffered thousands of causalities from Iraq's use of several chemical weapons in 1980s war. Other than the dead, thousands of civilian were contaminated in bordering towns including the children and relatives of veterans, many of whom have developed blood, lung and skin complications.

Salehi told Spiegel his country was willing to take part in an international conference on Syria proposed by the Russia and US, which could take place later this month.