Exiled leader Khaled Mashaal (center), in his first visit to Gaza, joins Hamas Prime Minister Ismail Haniyeh (right) to celebrate the 25th anniversary of the militant group. Once the target of an Israeli assassination attempt, Mr. Mashaal now is confident enough to enter Gaza and walk around in public. (Associated Press)

Exiled leader Khaled Mashaal (center), in his first visit to Gaza, joins Hamas Prime Minister Ismail Haniyeh (right) to celebrate the 25th anniversary of the militant group. Once the target of an Israeli assassination attempt, Mr. Mashaal now is confident enough to enter Gaza and walk around in public. (Associated Press)