Al-Hayya confirmed the death of the group’s leader, Yahya Sinwar DUBAI: Israeli hostages in Gaza will not return until “the aggression” on the besieged Palestinian enclave stops and Israeli forces withdraw, Khalil Al-Hayya, deputy Gaza Hamas chief and the group’s chief negotiator, said on Friday. In a televised statement, Al-Hayya confirmed the death of the group’s leader, Yahya Sinwar.