Before Israel killed him, Hamas leader Yahya Sinwar hid with six Israeli hostages, one of them a U.S. citizen.

Yahya Sinwar, the Hamas leader who was killed by Israeli forces in the Gaza Strip, was the mastermind behind the Oct. 7 attack on Israel that sparked the war. He rose to the top position in August after the killing of the previous leader,

Analysts call the killing of several Hamas leaders, including Yahya Sinwar, a deep blow to the Palestinian militant group, but expect it to keep fighting.