Najeeba Mugal, 13, right, and her sisters Laleema and Aminia, left and center, Afghan refugees who arrived in Quetta, Pakistan from Afghanistan with their family earlier in the week, stand in the four-square-meter mud house they seeked refuge in Friday, Sept. 28, 2001. The United Nations warned of a potential humanitarian catastrophy as tens of thousands of Afghans are expected to seek refuge in Pakistan, in anticipation of U.S. retaliatory strikes against Kabul’s Taliban rulers. (AP Photo/Jerome Delay)