Israel says Hamas leader Yassin 'marked for death

What is Hamas? Here's what to know : NPR

Ahmed Yassin was a quadriplegic refugee who ran a charity. How did he end up founding Hamas? - ABC News

Ismail Haniyeh Fast Facts

Most wanted: the three Hamas leaders Israel must eliminate - TODAY

GAZA: SHEIK AHMED YASSIN RETURNS TO A HERO'S WELCOME

Who is Yahya Sinwar, the Hamas political leader in Gaza?

Hamas-Israel deal imminent,' to the dismay of Palestinian factions

Profile: Ismail Haniya, Hamas' political chief, Hamas

Who is Yahya Sinwar, the Hamas political leader in Gaza?

Israel assassinates Hamas leader, Palestinian territories

GAZA: HAMAS LEADER AHMED YASSIN & PROTESTS

Yasser Arafat - Wikipedia

Hamas rallies in Gaza, marks 31st founding anniversary amid calls for anti- Israel attacks - Xinhua

Mohamed Deif and Yahya Sinwar, the masterminds of the Hamas attack who top Israel's most wanted list, International