Israel has launched airstrikes in southern Lebanon against Hezbollah, as the militant group says it has responded by launching "a large number of drones".
Sirens have been heard in northern parts of Israel - and reports suggest flights to and from Tel Aviv have been suspended.
In a statement, the Israel Defense Forces (IDF) accused Hezbollah of "preparing to file missiles and rockets toward Israeli territory".
"In a self-defence act to remove these threats, the IDF is striking terror targets in Lebanon," Israeli military spokesman Rear Admiral Daniel Hagari said.
Hezbollah said it has responded by launching a large number of drones on an "Israeli military target" as well as "a number of enemy sites and barracks and Iron Dome platforms".
The Iran-backed fighting group - designated a terrorist organisation by several countries including the UK - said its attacks were in retaliation for the killing of a top commander last month.
Fuad Shukr died in a strike in Beirut's southern suburbs.
The Israeli Prime Minister, Benjamin Netanyahu, described Shukr as "one of the most wanted terrorists in the world".
The Lebanese National News Agency described attacks by "enemy warplanes" which have caused "severe damage to property, crops, and infrastructure, especially the electricity and water networks".
Hezbollah has since issued a statement saying it has completed the "first phase" of its attack, after launching 320 Katyusha rockets and hitting 11 Israeli military sites.
There has been no independent confirmation about the claims, nor whether any damage has been caused.
Sunday's attack came as Egypt hosts a new round of talks aimed at ending Israel's war against Hamas, now in its 11th month.
Hezbollah has said it will halt the fighting if there is a ceasefire.
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