Hamas continued to fire rockets at Israel, including a pair intended for the city of Tel Aviv. One landed harmlessly, probably at sea; the other was thwarted in midair by Israel.
In Cairo, the leaders of Hamas, Turkey and Qatar gathered to try to broker a truce. Hamas officials were in indirect contact with Israel through Egyptian intelligence intermediaries, an official of Egypt’s Muslim Brotherhood said.
The talks were reported to be deadlocked on Saturday evening, while continued attacks in Gaza and Israel, and Israeli preparations for a possible ground invasion, suggested that neither side was ready to end the fight.
The air raid that struck the office of the Hamas prime minister, Ismael Haniyeh, came about 4 a.m., reducing the four-story building where weekly cabinet meetings were held to a huge pile of rubble.
Three Palestinian flags that used to hang over the entryway were draped across the dusty mess, with datebooks and personnel records scattered about. Mr. Haniyeh’s gray-bearded face beamed from a page of a Hamas booklet promoting “the government’s achievements despite the obstacles.”
A security official, who asked to be identified only as Abu el Abed, took one of the fallen flags and replanted it upright. “We will rebuild this place as we have rebuilt others,” he said. “Every structure that is demolished or destroyed is a big loss, but the blood of anybody wounded is more important than any structure. This place will be rebuilt and the occupation will go and we will stay.”
Mark Regev, a spokesman for Prime Minister Benjamin Netanyahu of Israel, said government buildings had been targeted because Hamas “makes no distinction between its terrorist military machine and the government structure.”
“We have seen Hamas consistently using so-called civilian facilities for the purposes of hiding their terrorist military machine, including weapons,” Mr. Regev said.
The Israeli military said that it had struck more than 200 targets overnight, including underground rocket launchers and smuggling tunnels in Rafah, on the Gaza-Egypt border. The military also said that it struck the police and homeland security headquarters of Hamas, as well as the house of a Hamas commander, Ahmed Randor.
Hamas’s military wing, the Qassam Brigades, claimed responsibility for firing an Iranian-made rocket at Tel Aviv.
Israel appeared to be keeping up the pressure on military targets as well.
Hamas said seven of its members were killed Saturday morning in two separate attacks — four in Rafah, and three in the Al Maghazi refugee camp, in the middle of the Gaza Strip. The deadliest airstrikes today were reported in the southern town of Rafah, which borders Egypt, where six people, including four Hamas fighters, were killed in separate raids.
Israeli F16 airplanes hit a house for a commander of the Qassam Brigades in southeast Gaza City, but the house was empty at the time, Hamas officials said. The Israeli military also released video of what it said was an attack Saturday on the house of the Hamas northern brigade commander, Ahmed Randor, and said that it showed the secondary explosions that took place because of ammunition stored under the commander’s house.
The Palestinian Health Ministry in Gaza said that 40 Palestinians had been killed in the fighting so far, and more than 385 people wounded. Three Israelis have been killed.
This latest battle between Israel and Hamas, the Islamist militant group that controls Gaza, began Wednesday, when Israel launched airstrikes on Gaza in retaliation for a surge of rocket attacks in recent months from Gaza. The assault has drawn comparisons to Israel’s invasion of Gaza in late 2008, but so far Israeli ground forces have not entered Gaza.
Last week, Israel shifted infantry brigades, authorized the calling up of 75,000 reservists and blocked roads near Gaza, indicating an invasion of the coastal territory was possible.
The region’s political landscape has also shifted since the war four years ago, with Hamas gaining crucial allies in Egypt, Turkey and Qatar, as well as longer-range, apparently Iranian-made, missiles.
Israel’s Iron Dome missile defense system appears to have successfully intercepted many of the rockets from Gaza. After an attack on Tel Aviv last week, Israel deployed an Iron Dome anti-missile battery near the city, which became operational on Saturday.
The missiles intercepted one of the Hamas rockets on Saturday evening in the sky above the city, Israeli authorities and witnesses said.
In Cairo, a senior official of the Muslim Brotherhood confirmed that President Morsi was working furiously to secure a cease-fire but insisted that the Israeli side of the talks remained the “sticking point.” The official did not identify a specific issue.
While the regional leaders met in various combinations around Cairo, foreign ministers of members of the Arab League met in an emergency closed door meeting to discuss responses to the situation, Egypt’s Foreign Ministry said.
President Obama, who has asked President Mohamed Morsi of Egypt to try to mediate the crisis, called Prime Minister Recep Tayyip Erdogan of Turkey on Friday to press for a solution, the White House said. Mr. Erdogan was among the regional leaders meeting in Cairo.
The Muslim Brotherhood, Egypt’s powerful Islamist group, called for Mr. Morsi to expel Israel’s ambassador and freeze relations with Israel. Mr. Morsi, a former Brotherhood leader, had already recalled Egypt’s ambassador to Israel.
In Gaza City, Ghazi Hamad, the deputy foreign minister of Hamas, said Israel’s shift in strategy, attacking Hamas government buildings, would not significantly change the dynamic of the current fighting.
“Israel has the capacity to destroy all buildings in Gaza, all homes,” he said. “They destroyed our government buildings before many times, but we rebuild again. It’s a long struggle, a long story. It will not stop today or tomorrow.”
Jodi Rudoren reported from Gaza, and Isabel Kershner from Jerusalem. Reporting was contributed by Fares Akram and Tyler Hicks from Gaza City, and Mayy El Sheikh and David D. Kirkpatrick from Cairo.
