Israel’s military said it was responding to rocket fire from Lebanon, which had reportedly killed one woman and injured several people.
A woman and two children are reported to be among four people killed in a wave of Israeli strikes on southern Lebanon.
Security sources told the Reuters news agency the deaths came during Israeli strikes on a village.
Eleven people were wounded across southern areas and the level of damage was “vast”, the sources said.
Lebanon’s powerful armed group Hezbollah said a strike on a separate town killed one of its fighters.
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Media reports in Lebanon said buildings were on fire after the attacks by Israel.
A spokesperson for the Israeli government said the strikes were launched after a woman died and eight other people were injured in a rocket attack on northern Israel.
Hezbollah is thought to be behind the initial rocket attack, but has not claimed responsibility.
The armed group did not announce any operations on Wednesday – but the head of its executive council warned the Israeli attacks “cannot pass without a response”.
The strike launched from inside Lebanon hit a military base and wounded several people on Wednesday, according to the Israeli government.
In a statement, the Israel Defence Forces (IDF) said: “A short while ago, IDF fighter jets struck a series of Hezbollah terror targets in the areas of Jabal el Braij, Houneh, Dunin, Aadchit and Souaneh.
“Among the targets struck were military compounds, operational control rooms, and terror infrastructure used by Hezbollah terrorists.
“Several targets belonged to the Redwan Forces.”
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Cross-border shelling has already killed more than 200 people in Lebanon, including more than 170 Hezbollah fighters, as well as around a dozen Israeli troops and some Israeli civilians.
Hezbollah and the Israeli military have been exchanging fire for more than four months.
It came after the armed group launched rockets across the disputed frontier in support of its Palestinian ally Hamas, which launched a deadly assault on Israel last October.
The exchange in fire has also displaced tens of thousands of people in the border areas of each country.
Emily Foster is a globe-trotting journalist based in the UK. Her articles offer readers a global perspective on international events, exploring complex geopolitical issues and providing a nuanced view of the world’s most pressing challenges.