The US does not have evidence of a chemical weapons attack in Syria, President Bashar al-Assad said in an interview, dpa reported.
"Nothing has been presented so far," the Syrian president said to broadcaster CBS. "Present what you have as evidence to the public."
He also referred to a presentation by former US secretary of state Colin Powell to the United Nations prior to the Iraq war: "When he showed the evidence, it was false."
Follow us on Twitter @TRENDNewsAgency