The Palestinian Center for Human Rights said in a statement Wednesday that Hamas is refusing to allow eight students leave Gaza. It said the students were granted AMIDEAST scholarships, a program that educates talented teenagers from the Middle East and North Africa for a year in the US

The ban comes a day after rights groups criticized orders by Hamas forcing aid workers and employees of nongovernment organizations to register with them before they travel.

Hamas also recently began auditing aid group accounts.

Hamas overran Gaza from the secular Palestinian Fatah party in bloody street battles in 2007.