Several Katyusha rockets fired from Lebanon hit northern Israel, Israeli military officials said.
There were no immediate reports of casualties from the strikes, the first in months across a border where a 2006 war was fought between Israel and Lebanon.
After the rockets landed in the western Galilee region, the Israeli army retaliated, striking the area from where they had been launched, the army said, without offering further specifics.
"The Israeli army considers that it is a serious incident and believes that it is the responsibility of the Lebanese government and the Lebanese army to avoid this kind of attacks," an army statement said.
Four rockets landed in Israel, according to a report on Israeli public radio. One caused minor damage, while another landed in a populated area but failed to explode.
Local military commanders were assessing the situation but people in northern Israel had not been told to go to air raid shelters, said an army spokesman.
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Israeli officials claim rockets fired from southern Lebanon hit northern Israel, no casualties reported [Al Jazeera]
Al Jazeera