GAZA CITY (AFP)--Tens of thousands of Israeli troops battled Hamas fighters in Gaza early on Monday amid tank, artillery and air strikes, as the death toll from the offensive to end rocket attacks passed 510.
Australian leader Kevin Rudd said Israel must meet its humanitarian obligations to residents in Gaza, as Chinese premier Hu Jintao asked "relevant parties will immediately stop their military activities and armed clashes and relax the situation."
Israeli forces moved into the fringes of Gaza City as families fled or hid on the second night of combat.
The Israeli government fought off intense international pressure over its biggest military operation since its 2006 war in Lebanon, with French President Nicolas Sarkozy due in the region, as well as Russian and E.U. delegations.
At least 70 Palestinians have been killed since the ground offensive began on Saturday night, Gaza medics said.
Israel said one soldier was killed by a mortar shell and another 19 were wounded, bringing the total to 49 since the beginning of the incursion.
Columns of troops and tanks surrounded Gaza City and fighting was reported in outer districts.
Witnesses said tanks had cut off Gaza City and the far north from the rest of the strip, which would prevent the entry of arms, supplies and fighters from the south.
Warplanes were also bombing targets in the southern border town of Rafah, where hundreds of tunnels are used to smuggle in supplies from Egypt.
The army declined to confirm the reports.
Fierce clashes were also reported around the northern towns of Beit Lahiya, Beit Hanun and Jabaliya.
Moawiya Hassanein, head of Gaza medical emergency services, said the number of Palestinians killed since the Israeli operation was launched on December 27 was now 512, including 87 children.
Five members of the same family died when a tank shell hit their car near Gaza City, emergency services said.
Three ambulance workers were killed when they were hit by a missile as they helped wounded victims of the conflict, medics said.
Aid groups said the offensive had aggravated a humanitarian crisis for the population, who have no electricity, no water and now face dire food shortages. Hospitals were only running on backup generators.
Rudd said it was "critical for Israel to meet its humanitarian obligations" under international law and ensure the people of Gaza had access to basic goods, food, humanitarian assistance and medical supplies.
International efforts to halt the conflict sought new impetus after the U.N. Security Council failed to agree a statement on the conflict, with the United States giving strong backing to Israel.
Sarkozy was scheduled to meet Israeli Prime Minister Ehud Olmert in Jerusalem and Palestinian president Mahmoud Abbas in Ramallah on Monday, after first meeting his Egyptian counterpart, Hosni Mubarak, in Cairo.
France hopes Egypt can rekindle its role as a mediator between Israel and Hamas.
In telephone talks with Sarkozy, Russian President Dmitry Medvedev and a host of other foreign leaders, Olmert refused to call off the offensive, his office said.
Czech Foreign Minister Karel Schwarzenberg, whose country holds the rotating EU presidency, is heading a delegation to the Middle East, while Medvedev's Middle East envoy, Alexander Saltanov, was also on the way.
The European Union and Russia are both part of the Middle East diplomatic Quartet, along with the United Nations and the United States.
Israel unleashed "Operation Cast Lead" on December 27 with the declared aim of ending rocket attacks on Israel that resumed after a six-month truce ended on December 19.
Rocket fire over the past week has killed four people in Israel. Thirty-two rockets and mortar rounds were fired across the border on Sunday and hit Sderot, Ashdod and other towns, lightly injuring three people.
Israel believes Hamas may be seeking "a respectable" way out of the conflict having underestimated the scope of the military offensive, Social Affairs Minister Isaac Herzog said.
He told CNN Hamas was under "huge pressure" from the military operation.
"The intelligence reports that we've received today in the Israeli cabinet are that the Hamas is looking for a respectable way of finding a way to get out of this situation," he said.
Israeli army spokesman Avi Benayahu told public television "Hamas has come to the conclusion that it has made an enormous strategic error by refusing to extend a ceasefire accord."
Al-Jazeera television said a Hamas delegation would go to Cairo on Monday at Egypt's invitation, but Hamas officials could not be reached for confirmation.
The Israeli offensive has sparked spiraling anger in the Muslim world and protests across the globe.
Israeli troops shot and killed a protester during a demonstration in the West Bank. Tens of thousands of Turks staged an anti-Israeli rally in Istanbul.
Protesters threw rocks and eggs at police outside the Israeli embassy in Oslo and police responded with tear gas.
The Security Council failed to agree a statement calling for a ceasefire in closed-door consultations late on Saturday.
That drew expressions of regret from UN chief Ban Ki-moon on Sunday, who said he would be working with key players to facilitate a consensus to bring about an end to the violence.
Hamas spokesman Fawzi Barhum condemned the Security Council action as "a farce" dominated by the United States, which has strongly supported Israel.
Egypt summoned the ambassadors of the U.N. Security Council's five permanent members - the U.K., China, France, Russia and the United States - to protest at the delay in passing a ceasefire resolution.
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