Ban said that he was preparing proposals for the UN Security Council (UNSC) to act upon in that case because "this would be an abominable crime".

"Syria dominated the summit meeting in a way no other political development has ever done at the G20 summit" in St. Petersburg, Russia, last week,” Ban told reporters at UN headquarters.

"It also dominated the bilateral meetings I had with world leaders," he added.

The over two-year old but still ongoing Syrian war has claimed more than 100,000 lives and displaced more than six million people.

(Agencies)

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