Israel intensified strikes on Gaza hours after a ceasefire and hostage release deal was announced, residents and authorities in the Palestinian enclave said, as mediators sought to quell fighting ahead of the truce's start on Sunday.

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

Mediators said Israel and Hamas have agreed to pause the fighting in Gaza starting Sunday after 15 months of war and to begin exchanging dozens of hostages held there for Palestinians imprisoned by Israel.