Several rockets fired from Lebanon set off loud explosions in northern Israel but caused no injuries or damage. The army says Israel retaliated with "massive" artillery fire into Lebanon.
Israel-Lebanon Border Clash

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United Nations Interim Force in Lebanon (UNIFIL) troops inspect the remains of a shell that was launched from Lebanon to Israel, Sarada, Lebanon, Dec. 29, 2013.

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A Lebanese army soldier holds the remains of a rocket, Sarada, Lebanon, Dec. 29, 2013.

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Lebanese army personnel inspect the remains of a shell that was launched from Lebanon to Israel. According to activists, the shell landed about 500m from the Lebanese-Israeli border, Sarada, Lebanon, Dec. 29, 2013.

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An Israeli soldier looks at a U.N. helicopter flying over the Israel-Lebanon border near the northern town of Metula, Israel, Dec. 29, 2013.