(Reuters) -Israeli Prime Minister Benjamin Netanyahu will not attend Monday's summit on ending the Gaza war in Egypt, his office said, after Cairo had earlier announced he would take part, a prospect that could have been awkward for some confirmed guests.

Despite widespread calls for his release, Abu Safiya was not among the hundreds of Palestinian detainees and prisoners freed Monday in exchange for 20 hostages held by Hamas.

Israel has also reportedly backed a group calling itself the Strike Force Against Terror, led by Hussam al-Astal, a member of the al-Majida clan. Al-Astal’s group also clashed with Hamas in early October before the ceasefire was announced, according to Israeli media.

Israel will open the Rafah crossing as planned today in a U-turn after Hamas returned the bodies of four more hostages, according to reports. It comes as Benjamin Netanyahu warned "all hell" will break loose if Hamas doesn't agree to disarm.

President Donald Trump has declared Israel’s war with Hamas over and sees the ceasefire as a chance for lasting peace in the Middle East

The last group of living hostages held by Hamas has returned to Israel, the Israeli military said, bringing an end to two years of captivity that plunged families into anguish and tore at Israeli society.