Eleven G20 states on Friday called for a \"strong international response\" to a chemical weapons attack in Syria they said was clearly carried out by the regime. \"The evidence clearly points to the Syrian government being responsible for the attack, which is part of a pattern of chemical weapons use by the regime,\" said the statement which was supported by states including Britain, France and the United States. \"We call for a strong international response to this grave violation of the world\'s rules and conscience that will send a clear message that this kind of atrocity can never be repeated,\" said the statement which was released by the White House.