There is no end in sight to Israel's effort to halt militant rocket fire, Prime Minister Benjamin Netanyahu said.

"I will end it when our goals are realized," he said. "And the overriding goal is to restore the peace and quiet."

Israel says it launched the offensive Tuesday in response to weeks of rocket fire from Gaza. At least 21 Palestinians were killed Friday, pushing the overall death toll to 106, including dozens of civilians, according to the Health Ministry in Gaza.

Palestinian militants have fired more than 600 rockets at Israel.

One rocket fired from the Gaza Strip struck a gas station and set it ablaze earlier Friday in southern Israel, wounding three people, one seriously, and the army said the condition of a soldier wounded by rocket shrapnel on Thursday had worsened. But there have been no deaths on the Israeli side, in large part because of a new rocket-defense system that has intercepted at least 129 incoming projectiles.

Also Friday, the Lebanese military said militants fired three rockets into northern Israel. The Israeli military responded with artillery fire.

Israel's allies have backed the country's right to self-defense, but they have called for restraint. And the top U.N. human rights official said the air campaign may violate international laws prohibiting the targeting of civilians.

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