JERUSALEM (AP) — Hamas is set to free six more Israeli hostages Saturday from the Gaza Strip, but the exchange for hundreds of Palestinian prisoners is shadowed by heightened tension between the adversaries that clouds the future of the fragile ceasefire deal.

Children and brothers Kfir and Ariel Bibas, symbols of the worst assault on Jews since the Holocaust, were kidnapped along with their mother by Hamas.

An Israeli official says the bodies of the youngest and one of the oldest captives seized by Hamas during the attack that ignited the war in Gaza are expected to be returned on Thursday.