The UN food agency on Tuesday expressed concern about the 125,000 Nigerian refugees who have fled to southeast Niger, where Boko Haram extremists have launched attacks in recent days. "The World Food Program (WFP) is particularly concerned by the attacks in the north of Nigeria, which are spreading to Niger, forcing thousands of people to flee," WFP spokeswoman Elisabeth Byrs said in Geneva. The spokeswoman emphasized "the appalling situation" in which refugees live in the Diffa region, where the population has nearly doubled and food supplies are becoming scarce.