The United Nations (UN) said on Friday they are estimating up to half a million Afghan nationals could flee a humanitarian crisis in their homeland in a worst-case scenario. The UN High Commissioner for Refugees (UNHCR) appealed to all neighboring countries to keep their borders open for refugees seeking safety after a Taliban takeover of Afghanistan this month and multiple bomb attacks by the ISIS terrorist group at Kabul’s airport earlier this week. “In terms of numbers, we are preparing for around 500,000 new refugees in the region. This is a worst-case scenario,” UNHCR Kelly Clements said during a news briefing in Geneva. “While we have not seen large outflows of Afghans at this point, the situation inside Afghanistan has evolved more rapidly than anyone expected,” she added. The exodus from the beleaguered Middle Eastern nation is likely to happen by the end of 2021, news agency AFP reported. Many …