Hamas leader Khaled Mashaal (left) and Palestinian Authority President Mahmoud Abbas are scheduled to meet next week to discuss actions on a deal reached in May to end a 4 1/2-year rift between Hamas and Mr. Abbas' Fatah party. (Associated Press)

Hamas leader Khaled Mashaal (left) and Palestinian Authority President Mahmoud Abbas are scheduled to meet next week to discuss actions on a deal reached in May to end a 4 1/2-year rift between Hamas and Mr. Abbas' Fatah party. (Associated Press)