Israeli tanks pushed into Gaza after two Israeli soldiers and two Palestinian gunmen were killed on Friday in the most deadly clash on the Gaza Strip border since Israel ended its offensive there 14 months ago.
Palestinian sources in Gaza said five tanks and two armored bulldozers advanced while firing toward Khan Younis in the middle of the rectangular enclave bordering the Mediterranean in Israel's extreme south, next to the border with Egypt, Reuters reported.
The Israeli army said an officer and a conscript were killed in an ambush by Palestinian gunmen against an Israeli military patrol. Two soldiers were wounded and two Palestinian fighters also died in the clash, Israeli officials said.
Palestinian officials did not immediately confirm the two deaths but Gaza hospital officials said said at least five Palestinians, including a 10-year-old boy, were wounded.
"I think it's true to say that this is one of the fiercest days we have had since operation Cast Lead happened," Israeli army spokeswoman Avital Leibovich said.
It was a "tragic and a painful" incident in a zone where there is "an everyday war", with Palestinian gunmen planting explosives near the fence and frequent cross-border fire at ranges of a couple of hundred yards, Leibovich said.
Settlement building
The clash did not appear to be directly linked to the current diplomatic impasse between Israel, the Palestinians and the United States over Israeli settlement of occupied West Bank land and stalled efforts to relaunch peace talks.
Israel insisted on Friday it would not change its policy of building homes in east Jerusalem, but vowed to end disagreement with the Obama administration on how to renew stalled peace talks with Palestinians.
The statement came as Prime Minister Benjamin Netanyahu convened senior cabinet ministers to consider confidence-building steps for reviving negotiations, as proposed by U.S. officials while Netanyahu was in Washington this week.
"Israeli construction policy in Jerusalem has remained the same for 42 years and isn't changing," said a written statement from Netanyahu's spokesman, Nir Hefez, suggesting Israeli cabinet ministers would not budge on that particular policy.
Israel: Hamas accountable
Israel unilaterally withdrew from Gaza in 2005.
The militant Islamist group Hamas, which has ruled the enclave since 2007, said its men had fired on Israeli soldiers who crossed into the Strip on Friday.
Hamas has largely held its fire since a costly three-week war with Israel in the opening days of 2009 in which some 1,400 Palestinians, mainly civilians, and 13 Israelis, mainly soldiers, were killed.
But smaller factions have violated the de facto truce by firing rockets and mortars into neighboring Israeli territory.
Israel said it was holding Hamas accountable for the violence, which made further retaliatory action likely.
"Hamas is accountable for any activity that takes place from Gaza to Israel. It doesn't matter if it took responsibility or not," a military spokeswoman told reporters.
Hamas said its gunmen acted to repel an Israeli incursion.
"An Israeli army force raided 500 meters (yards) into Palestinian territory, and was confronted by our gunmen," said Abu Obeida, spokesman for the Hamas armed wing. "This was our work, but it was carried out for defense."
Two other groups, Islamic Jihad and al-Aqsa Martyrs Brigades, said their men also took part in the fighting.
The Israeli army spokeswoman said the army unit was fired upon after crossing into Gaza in an operation to dismantle a mine.
Exchange of fire
Such pursuits are common practice for the Israelis, who try to maintain a buffer zone within the border fence off-limits to Palestinians.
Palestinian sources said there were further casualties but no details were immediately available.
The witnesses said that, during the fighting, soldiers carried away on a stretcher a wounded comrade and helicopters came to the scene, apparently for medical evacuations.
The statements by Hamas, Islamic Jihad and al-Aqsa Martyrs Brigades did not make clear who might have carried out the initial ambush on the Israeli patrol.
Tensions have run high along the Gaza frontier this month, with Israel launching repeated air strikes in response to Palestinian rocket attacks, one of which killed a Thai worker in a kibbutz last week.
An Israeli soldier was accidentally shot dead by comrades earlier this month as they rushed to intercept three Palestinian border-jumpers, who were later found to have been going in search of work in Israel.
The last time an Israeli soldier was killed on the Gaza border was 9 days after the offensive ended in January 2009, when a bomb planted by Palestinian gunman exploded
