US top diplomat Steve Witkoff began his Middle East tour on Wednesday, with Israeli media reporting his visit to both Israel and Gaza.
This comes as negotiations for the second phase of the Israel-Hamas truce are set to begin.
The ceasefire is aimed at ending the war and seeing the release of dozens of Israeli and hundreds of Palestinian captives.
According to US outlet Axios, citing an Israeli official, Witkoff visited the Netzarim Corridor in Gaza with Israeli Minister of Strategic Affairs Ron Dermer to discuss the ceasefire implementation and vehicle inspections.
Witkoff is also expected to visit the Philadelphi Corridor on the Egypt-Gaza border before heading to Israel for talks with Israeli Prime Minister Benjamin Netanyahu, according to Israel's i24 News.
Meanwhile, crowds of displaced Palestinians made the arduous journey back to heavily destroyed northern Gaza for a third day Wednesday, under the fragile ceasefire.
More than 376,000 Palestinians displaced by the war between Israel and Hamas have returned to northern Gaza, the UN's humanitarian body OCHA said Tuesday.