SEOUL, South Korea -- UN Secretary-General Ban Ki-moon is expressing deep disappointment at the collapse of a ceasefire in Syria and urging more unity from the international community.

Ban said Monday during prepared remarks in South Korea that the UN is trying to ease Syria's humanitarian woes and find a political solution to the crisis.

He says fighting in Syria must stop immediately and other countries and the United Nations need to do more to help.

Ban's remarks follow attacks between Syrian and opposition fighters that destroyed a UN-backed ceasefire that was supposed to quiet fighting during a four-day holiday.

The international community has been unable to ease 19 months of bloodshed in Syria.

Ban says "suffering will only grow" as long as international divisions remain.