Israel and Hamas are believed to have agreed that 10 living hostages and the remains of 18 others should be released during the first 60 days of a cease-fire, but they have not reached a consensus on how many Palestinian prisoners should be freed during the same period. Up to 20 hostages are still thought to be alive.

The deal comes more than 20 months into the conflict -- and more than three months after a previous deal ended.

Sources say Israel exploring changes to ceasefire and prisoner swap proposal, with Hamas expressing willingness to return to the Qatari plan.