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A Â鶹Éç investigation has heard claims that despite being decommissioned two years ago, chemical weapons continue to be used in Syria. The United Nations has launched an investigation into who is responsible. Victims and witnesses have told the Â鶹Éç they believe Syrian government forces have carried out chlorine attacks and at least two incidents involving suspected mustard gas have been blamed on Islamic State militants. The Syrian government denies ever using chemical weapons. Our International Correspondent Ian Pannell has met eyewitnesses and has spoken to some of those who've gathered evidence. (Photo: A Syrian man in the aftermath of a chemical attack.)