Israel is studying Hamas' response to a proposal for a 60-day ceasefire and release of half the hostages still held in Gaza, two Israeli officials said, although one source reiterated that all Israeli captives must be freed for the war to end.

The proposal from regional mediators would see Israeli hostages released in two batches during a 60-day truce, according to a Palestinian official.

It was unclear whether Prime Minister Benjamin Netanyahu of Israel was on board with the terms, which came as Qatar and Egypt were intensifying mediation efforts.