Akef

Hamas is an offshoot of the world's first modern radical Muslim group, the Muslim Brotherhood. From [1] AP:

Arabs condemned the assassination of Hamas leader Sheik Ahmed Yassin and vowed revenge on Israelis, while the United States quickly called for restraint from both sides of the Israeli-Palestinian conflict.

Mohammed Mahdi Akef, the leader of Egypt's Muslim Brotherhood, arguably the largest Islamic movement in the Middle East, issued a warning to all Americans and Israelis.

"There can be no life for the Americans and Zionists in the region," Akef told the pan-Arabic satellite television Al-Jazeera. "We will not rest until they (Israelis) are expelled from the region."