At least four rockets were on Thursday fired from southern Lebanon toward Israel, Lebanon's official National News Agency and the Israeli army said.
No injuries or damage were reported, dpa reported.
The Israeli military said the rockets were likely fired by Sunni Muslim radicals belonging to the global jihad movement, and not by the Shiite militant group Hezbollah.
One rocket was intercepted by Israel's Iron Dome missile defence system between the northern Israeli towns of Akko and Nahariya, an Israeli army spokesman said. Two rockets fell in Lebanese territory.
There has been no claim of responsibility for the attack.
Shortly after the attack, Israeli aircraft flew at low altitude over southern Lebanon. The Israeli military denied that it had carried out air strikes in southern Lebanon after the attack.
The Lebanese army said it had found rocket launchers in an area near the coastal city of Tyre.
The attack set off air raid sirens in northern Israeli towns, prompting residents to seek shelter. Israeli media said two people were treated for shock.
The Israeli army has raised the level of alert along the border.
Hezbollah fought the Israeli army in southern Lebanon for some two decades until Israel withdrew in 2000. The two sides fought a 34-day war in 2006.
The Israeli-Lebanese border has been largely quiet since then, despite tensions over the war in neighbouring Syria.
Four Israeli soldiers were injured in an explosion along the border with Lebanon last month.
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