It says an undetermined number of American citizens remain missing and unaccounted for.

该组织说，仍有数量不详的美国公民下落不明。

An estimated 200 non-Afghans flew to Qatar from Kabul, including an undetermined number of American citizens.

据估计，有200名非阿富汗人从喀布尔飞往卡塔尔，其中包括数量不详的美国公民。