Fire was exchanged across the Israeli-Lebanese border after the death of a senior member of the Hezbollah movement.
Samir Qantar was killed in a rocket attack, suspected to have been carried out by Israel, near Damascus, Syria.
The Israeli army said it fired artillery shells into Lebanon after rocket attacks from across the border.
Mr Qantar, who was Druze, was jailed in Israel in 1979 but released as part of a prisoner swap with the Lebanese militant group in 2008.
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