Hamas has resumed firing rockets at Israel from Gaza after a 12-hour humanitarian window which the world had said should pave the way for a longer-term truce.
The rocket fire came shortly after Israel announced it would extend the humanitarian ceasefire for another four hours, as its security cabinet debated whether to press on with the 19-day operation.
The conflict has claimed more than 1000 Palestinian lives, most of them civilians, and has killed 40 Israeli soldiers as well as three civilians inside Israel.
US Secretary of State John Kerry met European and Middle Eastern foreign ministers in Paris earlier to push both sides to extend the temporary truce, which began at 0500 GMT on Saturday (1500 AEST).
Israel said it had extended the ceasefire for another four hours past its 1700 GMT (0300 AEST Sunday) expiry, but Hamas refused to comment.
Shortly after the original 12-hour window closed, Hamas said it fired a barrage of rockets at Tel Aviv in central Israel, Ashkelon and Nachal Oz in the south.
Israel’s military said Gaza militants fired projectiles “despite the humanitarian truce being extended”, but insisted it would hold fire until midnight local time (0700 AEST).
“We all call on parties to extend the humanitarian ceasefire,” France’s Foreign Minister Laurent Fabius told reporters in Paris after meeting Kerry and foreign ministers from Britain, Germany, Italy, Qatar and Turkey, as well as an EU representative.
“We all want to obtain a lasting ceasefire as quickly as possible that addresses both Israeli requirements in terms of security and Palestinian requirements in terms of socio-economic development.”
A spokesman for UN chief Ban Ki-moon said in a statement he “urgently appeals once again to all parties to declare a seven-day humanitarian ceasefire in Gaza”.
During the 12-hour ceasefire, medics digging through the remains of hundreds of Gaza homes uncovered at least 147 bodies.
The grim discoveries pushed the Palestinian toll in Gaza to more than 1000 since the conflict erupted on July 8.
Israel also announced the deaths of three more soldiers, raising its military toll to 40, along with two Israeli civilians and a Thai worker killed.
On the ground, Palestinian ambulances sped into Gaza neighbourhoods that have been too dangerous to enter for days.
Palestinians ventured onto Gaza’s streets after the truce began, some eager to check homes they had fled, others to stock up on supplies.
In many places they found astonishing devastation: buildings levelled, entire blocks of homes wiped out by Israeli bombardment.
In northern Beit Hanun, even the hospital was badly damaged by shelling, and correspondents saw the charred body of a paramedic.
There were similar scenes in Shejaiya, where stiff bodies lay on the floor of a room in one building, one caked in dried blood, all of them covered in dust.
Hamas and Israel agreed to the “humanitarian window” early on Saturday, after Israel’s security cabinet on Friday night rejected a US proposal for a seven-day truce during which the two sides would negotiate a longer-term deal.