He said it was ridiculous to suggest the Syrian government was to blame for the attack.

“Syrian government troops are on the offensive and have surrounded the opposition in several regions,” he said.

“In these conditions, to give a trump card to those who are calling for a military intervention is utter nonsense.”

“So I’m convinced that is nothing more than a provocation by those who want to drag other countries into the Syrian conflict.”

He said that the US failure to present evidence to the international community was “simply disrespectful”.

“If there is evidence it should be shown. If it is not shown, then there isn’t any,” he said.