In Israel, many observers believe a response is imminent after Supreme Leader Ayatollah Ali Khamenei said Iran would "harshly punish" Israel for the strike in Tehran.
The attack would be in retaliation for the killing of Hamas leader Ismail Haniyeh in Tehran in late July, Ravid added.
Many airlines globally are revising their schedules to avoid Iranian and Lebanese airspace while also calling off flights to Israel and Lebanon.