Hamas chief Khaled Mashaal waves to Palestinian Hamas supporters during a rally to commemorate the 25th anniversary of the militant group, in Gaza City, Gaza Strip, on Saturday, Dec. 8, 2012. (AP Photo/Hatem Moussa)

Photo by: Hatem Moussa

Hamas chief Khaled Mashaal waves to Palestinian Hamas supporters during a rally to commemorate the 25th anniversary of the militant group, in Gaza City, Gaza Strip, on Saturday, Dec. 8, 2012. (AP Photo/Hatem Moussa)