GENEVA— The International Commission of Inquiry on Syria is calling on states to curb the flow of weapons to armed groups, which it blames for fueling the war that has killed nearly one quarter of a million people in Syria since March 2011. The Commission has presented an oral update of its latest findings to the UN Human Rights Council.In a hard-hitting emotional presentation before the U.N. Human Rights Council, Commission Chair Paulo Sergio Pinheiro told members of the U.N. Council that Syria has fallen apart before their eyes“A nation has collapsed into the world’s most chaotic and lethal battlefield....