File - In this Dec. 9, 2012 file photo, Hamas leader Khaled Mashaal waves during his visit to the Islamic University in Gaza City. Hamas chief Khaled Mashaal has set an ambitious agenda for his new term, seeking to transform his once isolated Islamic militant movement into a widely recognized political force, without making concessions toward Israel needed for international acceptance. (AP Photo/Hatem Moussa, File)

Associated Press
File - In this Dec. 9, 2012 file photo, Hamas leader Khaled Mashaal waves during his visit to the Islamic University in Gaza City. Hamas chief Khaled Mashaal has set an ambitious agenda for his new term, seeking to transform his once isolated Islamic militant movement into a widely recognized political force, without making concessions toward Israel needed for international acceptance. (AP Photo/Hatem Moussa, File)
File - In this Dec. 9, 2012 file photo, Hamas leader Khaled Mashaal waves during his visit to the Islamic University in Gaza City. Hamas chief Khaled Mashaal has set an ambitious agenda for his new term, seeking to transform his once isolated Islamic militant movement into a widely recognized political force, without making concessions toward Israel needed for international acceptance. (AP Photo/Hatem Moussa, File)
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