The U.S.-backed proposal for a 60-day ceasefire between Israel and Hamas envisages a phased release of hostages, Israeli troop withdrawals from parts of Gaza and discussions on ending the conflict, an official familiar with the negotiations said on Thursday.

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.