Residents in Gaza are using a 12-hour humanitarian truce to return to their homes, gather essential supplies and search for thosetrapped in the rubble.
At least 85 bodies have been pulled from the rubble during the truce, a Palestinian health official says.
That raises the Palestinian death toll to 985 since the Israel-Hamas conflict began on 8 July, the spokesman said. Thirty-nine Israelis have died.
International talks on a longer truce have resumed in Paris.
Israel said it would continue to "locate and neutralise" Hamas tunnels during the pause, which began at 08:00 local time (05:00 GMT).
So far 31 tunnels have been discovered, with about half destroyed, Israeli's military says.
Before the truce began, Israeli strikes killed at least 19 Palestinians overnight at a family home near Khan Younis in the southern Gaza Strip.
Images showed relatives weeping as the bodies of five children were taken to a local morgue.
Two Israeli soldiers were also killed overnight, Israel's military confirmed.
The Iron Dome defence system intercepted three rockets fired towards the southern Israeli town of Ashkelon overnight.
In the district of Shejaiya, residents started flooding back from 08:00, despite warnings not to do so.
The scene here is just astonishing - the most widespread destruction: buildings completely pulverised, cars thrown 50m (160ft) into the air on top of buildings, the facades of some block of flats completely ripped off.
The air is pretty thick with the stench of death as people try to recover bodies and belongings.
In the background I can hear a crackle of gunfire. Although a humanitarian ceasefire is in place, clearly people are still shooting. There is an Israeli drone flying overhead, and we've heard the sound of fighter jets.
I think people feel they have a brief window of opportunity to do as much as they can and then frankly get out of here.