Israel's military said it launched airstrikes against Hezbollah sites in Lebanon on Monday, which Lebanese authorities said had killed 492 people and sent tens of thousands fleeing for safety in the country's deadliest day in decades.

After some of the heaviest cross-border exchanges of fire since hostilities flared in October, Israel warned people in Lebanon to evacuate areas where it said the armed movement was storing weapons.

Israeli Prime Minister Benjamin Netanyahu sent a short video statement addressed to the Lebanese people.