The dispute underscores the fragility of the deal as mediators worked to ensure that it would go into effect on schedule.

The deal, mediated by the United States, offered a glimmer of hope in a conflict that has taken an immense human toll.

Israel and Hamas have agreed a Gaza ceasefire and hostage deal following meetings with Qatar's prime minister, a source briefed on the talks has told the BBC. There was no confirmation from the Israeli government or Hamas, but a Hamas official earlier told the BBC it had approved a draft from Qatari, US and Egyptian mediators.