The Israeli military said on Tuesday that missiles had been launched from Iran towards Israel, and that its home front command had provided life-saving guidelines to people in various parts of the country.
Earlier, the military had announced that any ballistic missile strike from Iran was expected to be widespread and told the public to shelter in safe rooms in the event of an attack.
The Israeli army also said Israel's airspace was closed following the Iranian attack.
The firing of missiles came after Israeli troops launched ground raids into Lebanon, in the biggest escalation of regional warfare since fighting erupted in Gaza a year ago.
Iran has vowed to retaliate following attacks that killed the top leadership of its Hezbollah allies in Lebanon.
Iran's Revolutionary Guards said the country had launched tens of missiles at Israel, and that if Israel retaliated, Tehran's response would be more crushing.
In Washington, President Joe Biden said the United States was prepared to help Israel defend itself.
Meanwhile, four people were killed and seven wounded in a shooting attack in the Jaffa neighbourhood of Tel Aviv on Tuesday. Israeli police said the two shooters had been "neutralised" and the situation was under control.
A Ukrainian F-16 fighter pilot died in a crash while repelling a Russian air attack that involved hundreds of drones, cruise and ballistic missiles, authorities said on Sunday, as Moscow intensifies night-time air barrages in the fourth year of war.
Two firefighters were shot dead while responding to a fire in northern Idaho and the body of a man was later found with a gun nearby, the Kootenai County Sheriff's Office said on Sunday, as it lifted a shelter-in-place order.
Iran could be producing enriched uranium in a few months, the head of the UN nuclear watchdog Rafael Grossi was quoted as saying on Sunday, raising doubts about how effective US strikes to destroy Tehran's nuclear programme have been.
The Jerusalem District Court has cancelled this week's hearings in Prime Minister Benjamin Netanyahu's long-running corruption trial, accepting a request the Israeli leader made citing classified diplomatic and security grounds.
The Israeli military ordered Palestinians to evacuate areas in northern Gaza on Sunday before intensified fighting against Hamas, as US President Donald Trump called for an end to the war amid renewed efforts to broker a ceasefire.