Israeli Prime Minister Benjamin Netanyahu says Iran "made a big mistake and will pay" for launching at least 180 missiles at Israel.
Israeli authorities say there were no injuries and only scattered damage and fires from falling shrapnel.
According to Israeli security officials, most of the missiles launched were intercepted, though there were some direct hits.
The missile attack came after Israel said its ground troops crossed into Lebanon overnight, launching what the military described as "localized" raids to root out Hezbollah fighters and infrastructure.
Hezbollah has said there are no sign of Israeli forces.
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