SANAA, Yemen (AP) — Deaths resulting from a diphtheria outbreak in Yemen are "likely to rise" if the naval blockade imposed by a Saudi-led coalition fighting to defeat Shiite rebels in war-torn Yemen remains in place, an international aid group warned on Monday. Save the Children said in a statement that Yemeni children are bearing the brunt of what it described as a "the worst diphtheria outbreak for a generation." It also said that its aid workers have been struggling to cope with the disease which has killed at least 52 people, mostly among children under 15, and is believed to have infected some 716 others since August.