Hamas Gaza chief Mohammed Sinwar Killed in Israeli Strike: Netanyahu Confirms Major Blow to Hamas. Israeli Prime Minister Benjamin Netanyahu has officially confirmed the killing of Mohammed Sinwar, a senior Hamas commander and the younger brother of slain Hamas leader Yahya Sinwar. The announcement was made during a Knesset address, where Netanyahu stated the Israeli military had “eliminated Mohammed Sinwar,” marking what he called a pivotal step toward the complete defeat of Hamas.