Sinwar stayed in Rafah for some time during the war, according to the sources, both above and underground.
Out of the 101 hostages currently detained in Gaza captivity, 51 are believed to be alive, 37 are confirmed dead, and 12 are unaccounted for.
On October 7, Akadih infiltrated into Kibbutz Nir Oz and has since served as the aide to the Nukhba commander of the Khan Yunis Brigade.
This comes after the Saturday announcement of two soldiers who were also killed in combat in the northern Gaza Strip.
In the same incident, an additional soldier from the Shaked Battalion was severely wounded.
The tunnel contained several long-term living areas used by Hamas terrorists throughout the war.
Hamas also investigated suspects who allegedly leaked Deif's location to Israel which led to his assassination.
The effort will come in tandem with the WHO and UNICEF.
They urged all parties fighting in Gaza to protect civilians and called on Israel to "ceases its assault on Gaza and on the humanitarians trying to help."
Kassab was responsible for Hamas's relations and cooperation, strategic and military, with other terrorist organizations within the Gaza Strip.