Two children were killed in Haiti on Christmas Day by an armed group that has ramped up its campaign of violence despite having its leader sanctioned by both the United States and United Nations. The children, both girls under age 10, were killed along with two adults when the gang, 400 Mawozo, carried out a deadly assault on Monday on the outskirts of Port-au-Prince in the Croix-des-Bouquets neighborhood, the United Nations said. Additionally, four family members were kidnapped. The gang has been intensifying its attacks in communities east of the capital. The week before Christmas, at least …