GAZA CITY, Gaza Strip — Israeli troops pushed deeper into Gaza on Friday in a ground offensive that officials said could last up to two weeks as the prime minister ordered the military to prepare for a “significantly” wider campaign.

The assault raised risks of a bloodier conflict amid escalating Palestinian civilian casualties and the first Israeli military death – and brought questions of how far Israel will go to cripple Gaza’s Hamas rulers.

Officially, the goal remains to destroy a network of tunnels militants use to infiltrate Israel and attack civilians. In its first day on the ground in Gaza, the military said it took up positions beyond the border, encountered little resistance from Hamas fighters and made steady progress in destroying the tunnels. Military officials said the quick work means that within a day or two, Israeli leaders may already have to decide whether to expand the operation.

With calls from Israeli hard-liners to completely crush Hamas, it remains unclear how far Israel will go in an operation that has already seen 299 Palestinians killed in 11 days of intense Israeli bombardment of the densely populated coastal strip, a fifth of them children.

Israeli Prime Minister Benjamin Netanyahu said he had ordered the military to prepare for a “significant expansion” of the ground offensive.

“It is not possible to deal with tunnels only from the air. It needs to be done also from the ground,” he told a special Cabinet meeting in Tel Aviv. “We chose to begin this operation after the other options were exhausted and with the understanding that without the operation, the price we will pay can be very high.”

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Frustrated by Hamas’ refusal to accept an Egyptian-brokered truce agreement and the failure of a 10-day campaign of more than 2,000 airstrikes to halt relentless rocket fire on Israeli cities, Israel launched a ground offensive it had previously been reticent to undertake to further weaken Hamas militarily.

“It won’t end that quickly,” said Yitzhak Aharonovitch, Israel’s minister of public security. “Anything can happen. If we need to keep going, we will keep going. We won’t stop. We need quiet for the citizens of the south and the citizens of Israel.”

In a fresh effort to broker a truce, U.N. chief Ban Ki-moon was to leave Saturday for the Middle East to help mediate the Gaza conflict, U.N. officials said. A cease-fire is “indispensable” for urgently needed humanitarian efforts to succeed, the under-secretary-general for political affairs Jeffrey Feltman told an emergency meeting of the Security Council.

The Israeli military said it had killed nearly 20 militants in exchanges of fire since the ground offensive started on Thursday night.

Gaza health officials said more than 50 Palestinians have been killed since then, including three young siblings from the Abu Musallam family who were killed when a tank shell hit their home.

At the morgue, 11-year-old Ahmed’s face was blackened by soot, and he and his 14-year-old sister, Walaa, and 16-year-old brother, Mohammed, were wrapped in white burial shrouds. Their father, Ismail, said the three were sleeping when the shell struck and he had to dig them out from under the rubble.

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Israel says it is going to great lengths to avoid civilian casualties and blames them on Hamas, accusing it of firing from within residential neighborhoods and using its civilians as “human shields.” On Thursday, the U.N. refugee agency for Palestinians, UNRWA, said a routine check in one of its vacant Gaza schools found about 20 hidden rockets and called on militants to respect the “sanctity and integrity” of U.N. property.

“The ground offensive does not scare us and we pledge to drown the occupation army in Gaza mud,” Hamas spokesman Sami Abu Zuhri said in a statement.

The order to launch the ground operation was triggered not by the rocket fire, but by a Hamas attempt to infiltrate Israel on Thursday, when 13 armed militants sneaked through a tunnel from Gaza and were killed by an airstrike as they emerged inside Israel.

The military, which has already mobilized more than 50,000 reservists, said paratroopers had uncovered eight tunnel access points across the Gaza Strip and engaged in several gun battles with Hamas militants who ambushed them. Hamas has survived Israeli offensives in the past, including a major three-week ground operation in January 2009 and another weeklong air offensive in 2012, but in each case the militant group recovered. It now controls an arsenal of thousands of rockets, some long range and powerful, and it has built a system of underground bunkers.

But Hamas is weaker than it was during the previous two offensives, with little international or even regional support from its main allies, Turkey and Qatar.


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