Two rockets have hit the northern Israeli port city of Haifa, several hours after the militant Lebanese group Hezbollah threatened to attack it.
Hezbollah had said it would attack Haifa if Israeli planes bombed Beirut.
But Hezbollah denied firing any rockets on Israel. There were no immediate reports of injuries or damage, BBC reported.
Israel's third largest city Haifa is located more than 30km away from the Lebanese border and was thought to be out of Hezbollah's range.
Later, Lebanon's international airport was hit by strikes for the second time in a day.
The Beirut airport was already closed following Israeli air strikes earlier on Thursday.