U.S. State Department cites security concerns as reason visas were withdrawn . The United States has been under pressure to do more for refugees from the Syrian conflict and other conflicts in Africa and elsewhere. Israel reportedly acts to prevent the students from leaving Gaza . Advocacy group says Palestinians need more access to higher education .
U.S. State Department cites security concerns as reason visas were withdrawn . Three Palestinian students were among seven who had earlier had visas pulled . Israel reportedly acts to prevent the students from leaving Gaza . Advocacy group says Palestinians need more access to higher education .