Ban said Wednesday a United Nation team investigating the alleged chemical attack must be given time to establish the facts.
And he has urged the United Nations Security Council not to be "missing in action" as the Syria crisis deepens.
Ban was speaking in the Great Hall of Justice at the Peace Palace in The Hague, which is marking its 100th anniversary.
"Give peace a chance. Give diplomacy a chance. Stop acting and start talking," he said.
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