Israel's continuing air strikes may have already forced as many as one million people from their homes across Lebanon.
Lebanon Prime Minister Najib Mikati says it is the largest displacement movement that may have happened.
Lebanon's Health Ministry reported more than 50 people were killed in yesterday's strikes - two days after Israel assassinated Hezbollah leader Hassan Nasrallah in Beirut.
Meanwhile, Hezbollah fired more rockets into northern Israel.
In a separate development, Israel says it had carried out "large-scale" air strikes on military targets of the Iran-backed Houthi movement in Yemen.
Hezbollah confirmed yesterday that top military commander Ali Karaki and a senior cleric, Sheikh Nabil Qaouk, had also been killed in the Israeli air strikes.
Also yesterday, Israel said it carried out air strikes on Houthi targets in Yemen, striking power plants and a port in Ras Isa and Hudaydah.
Footage later emerged showing a huge explosion at the port.
Israel says it targeted the sites in response to recent missile attacks from the Houthis, as well as to destroy facilities being used to transport Iranian weapons.
The Houthis, a Shia group controlling large areas of Yemen, condemned the Israeli strikes as a "brutal aggression".
They say four people were killed and 33 injured, vowing revenge.
There are mounting international fears of a wider conflict in the Middle East.
Washington warned Israel against an all-out war with Hezbollah or Iran, saying a major conflict would leave Israelis unable to return to their homes in the north.
Source : BBC
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