 It said the strike was on what they called a Hamas compound in al-Muassi, which is designated a humanitarian safe zone by the Israeli military and sheltered thousands of displaced Palestinians. Scott Anderson, the deputy humanitarian coordinator for the United Nations Agency for Palestinian Affairs in Gaza, visited a hospital in al-Muassi yesterday. In a statement, he described toddlers with double amputations, paralyzed children, and said that the air was filled with the smell of blood.