article_snippet.sent: UN Secretary-General 
article_snippet.sent: Ban Ki-Moon called the Nimrud attack 'a war crime.'
article_snippet.sent: The United Nations said The United Nations was very concerned about the safety of the population.
article_snippet.sent: Chris Gunness of the The United Nations Relief and Works agency said: 'The situation in Yarmouk is an affront to the humanity of all of us, a source of universal shame. '
article_snippet.sent: Yarmouk is a test, a challenge for the international community.
article_snippet.sent: The credibility of the international system itself is at stake.'