** FILE ** Palestinian President Mahmoud Abbas (left) and Khaled Mashaal (right), chief of the Islamic militant group Hamas, sit with Qatar's crown prince, Sheik Tamim Bin Hamad Al Thani, as they sign a reconciliation agreement in Doha, Qatar, on Monday, Feb. 6, 2012. (AP Photo/Thaer Ghanaim, Palestinian President's Office)

Photo by: Thaer Ghanaim

** FILE ** Palestinian President Mahmoud Abbas (left) and Khaled Mashaal (right), chief of the Islamic militant group Hamas, sit with Qatar's crown prince, Sheik Tamim Bin Hamad Al Thani, as they sign a reconciliation agreement in Doha, Qatar, on Monday, Feb. 6, 2012. (AP Photo/Thaer Ghanaim, Palestinian President's Office)