Israel's military says it struck targets near Sidon in southern Lebanon on Monday.
Videos shared on social media showed explosions in the town of Ghaziyeh, about 30km (19 miles) from the border with Israel.
An Israeli military spokesman said the strikes hit weapons depots in response to a drone launched into Israel by the Iran-backed Hezbollah group.
There were no immediate reports of casualties.
Israel and Hezbollah have been exchanging almost daily cross-border strikes since the start of the war between Israel and Hamas in Gaza.
