An explosive device was detonated against Israeli soldiers patrolling the border with Lebanon on Friday, causing no injuries, Israel's military said.
Israel shot six mortars into southern Lebanon, causing no damage or injuries, a Lebanese security source said, and an Israeli military spokeswoman said she was checking whether the army had returned fire.
The Israel-Lebanon border has been mostly quiet since Israel and the Lebanese militia Hezbollah fought an inconclusive war in 2006, even as civil war has raged in neighboring Syria.
Hezbollah has been helping President Bashar Assad in Syria fight rebels trying to topple his government.
Earlier this month Israel said its troops shot two Hezbollah gunmen who tried to plant a bomb farther east near the fence between the Israeli-controlled Golan Heights and Syrian-held territory.
Reporting by Ari Rabinovitch and Alexander Dziadosz; Editing by Sonya Hepinstall