The State Department expressed security concerns as the visas were withdrawn . Three Palestinian students were among seven who had earlier had visas pulled . Israel reportedly acts to prevent the students from leaving Palestine . The 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U.S. State Department cites security concerns as reason visas were withdrawn .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 .