In neighbourhoods levelled by 15 months of war with Israel, Hamas officials are overseeing the clearance of rubble in the wake of Sunday's ceasefire. The group's gunmen are guarding aid convoys on Gaza's dusty roads, and its blue-uniformed police once again patrol city streets, sending a clear message: Hamas remains in charge.

Israeli officials have described a parade of jubilant Hamas fighters that celebrated the ceasefire on Sunday in front of cheering crowds as a carefully orchestrated attempt to exaggerate the Palestinian militant group's strength.

But, in the days since the ceasefire took effect, Gaza's Hamas-run administration has moved quickly to reimpose security, to curb looting, and to start restoring basic services to parts of the enclave, swathes of which have been reduced to wasteland by the Israeli offensive.

Reuters spoke to more than a dozen residents, officials, regional diplomats and security experts who said that, despite Israel's vow to destroy it, Hamas remains deeply entrenched in Gaza and its hold on power represents a challenge to implementing a permanent ceasefire.