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Israel has authorized the call-up of as many as 75,000 reservists ahead of a possible ground operation. Dozens of armored vehicles have massed along the border with Gaza in recent days.

Israeli officials say they have not yet decided whether to send in ground troops, a decision that would almost certainly lead to heavy casualties on both sides.

In Saturday’s fighting, Israeli aircraft pounded militants’ weapons storage facilities and underground rocket launching sites, and went after rocket squads more aggressively.

Militants, undaunted, have unleashed some 500 rockets against the Jewish state.

Hamas claims that Israeli intelligence is based on a network of collaborators in Gaza. Officials said two Palestinians have been executed by Hamas‘ military wing for allegedly providing Israel with sensitive information. One man was shot twice in the head. Another body was tossed into a garbage bin with a gunshot wound to the head.

The violence has threatened the Mideast with a new war. At the same time, revolts against entrenched regional regimes have opened up new possibilities for Hamas. Islamists across the Mideast have been strengthened, bringing newfound recognition to Hamas, which had previously been shunned by the international community because of its refusal to recognize Israel and renounce violence.

A high-level Tunisian delegation, led by Foreign Minister Rafik Abdessalem, drove that point home with a visit to Gaza on Saturday. The foreign minister’s first stop was the still-smoldering ruins of the three-story office building of Gaza’s prime minister, Ismail Haniyeh of Hamas.

Israel has to understand that there is an international law and it has to respect the international law to stop the aggression against the Palestinian people,” Abdessalem told the AP during a tour of Gaza’s main hospital. He said his country was doing whatever it can to promote a cease-fire, but did not elaborate.

It was the first official Tunisian visit since Hamas’s violent 2007 takeover of the territory. The West Bank is governed by Palestinian President Mahmoud Abbas. Egypt’s prime minister visited Gaza on Friday and a Moroccan delegation was due on Sunday, following a landmark visit by Qatar’s leader last month.

Israel had been incrementally expanding its operation beyond military targets but before dawn on Saturday it ramped that up dramatically, hitting Hamas symbols of power.

Israeli defense officials, speaking on condition of anonymity to discuss confidential decisions, said military chief Lt. Gen. Benny Gantz personally ordered the scope of the airstrikes to be increased.

Haniyeh’s three-story office building was flattened by an airstrike that blew out windows in neighboring homes. He was not inside the building at the time.

Another airstrike brought down the three-story home of a Hamas commander in the Jebaliya refugee camp near Gaza City, critically wounding him and injuring other residents of the building, medics said.

Missiles smashed into two small security facilities and the massive Hamas police headquarters in Gaza City, setting off a huge blaze that engulfed nearby houses and civilian cars parked outside, the Interior Ministry reported. No one was inside the buildings.

The Interior Ministry said a government compound was also hit while devout Muslims streamed to the area for early morning prayers, although no casualties were reported.

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