Hamas is seeking guarantees that a new U.S.-backed ceasefire proposal for Gaza would lead to the war's end, a source close to the militant group said on Thursday, as medics said Israeli strikes across the territory had killed scores more people.

The rise of Izz al-Din al-Haddad in the chain of command suggests the group will hold firm to its position demanding a total end to the war before releasing all remaining hostages.

Israel has agreed to a U.S. proposal for a temporary ceasefire with Hamas after reneging on a previous path for peace earlier this year, Israeli Foreign Minister Gideon Saar reportedly confirmed Wednesday.