Israel said it has carried out an air strike against what it said was a “military structure” used by the armed group, Hezbollah in southern Lebanon.
The Lebanese health ministry said four people were killed in the strike on a house in the town of Maifadoun, around 30km from the Israeli border.
Security sources told the AFP news agency that the four men were Hezbollah fighters.
In an apparent response, the group launched drone strikes on towns in northern Israel, injuring two people.
It comes amid increasing tensions between Israel and Hezbollah, and with Iran which backs the group