France on Monday blocked access to the stands of five Israeli arms manufacturers at the Paris Air show for displaying "offensive weapons", according to a French government source.

A black wall blocked off stands run by Israel Aerospace Industries (IAI), Rafael, Uvision, Elbit and Aeronautics for showing "offensive weapons", including those used in Gaza, which allegedly violated terms made with Israel, said the source.

President Donald Trump rejected a plan presented by Israel to the U.S. to kill Iran's Supreme Leader Ayatollah Ali Khamenei, according to a U.S. official familiar with the matter.

The Israelis informed the Trump administration in recent days that they had developed a credible plan to kill Khamenei.

The Iranian president on Monday urged all citizens to put aside differences and unite against Israel as conflict rages between the two arch-foes.

"Every difference, issue, and problem that has existed must be put aside today and we must stand strong against this genocidal criminal aggression with unity and coherence," Masoud Pezeshkian said, addressing parliament.

Iranian missiles have killed at least 24 people in Israel since Friday, the Israeli prime minister's office said in an updated toll following the latest attacks.

The toll issued on Monday includes 11 deaths recorded since midnight, the office said, including four in Petakh Tikva near Tel Aviv, three in Haifa and one in the Bnei Brak suburb of Tel Aviv. It also includes two bodies retrieved following a previous strike on Bat Yam and one more killed in an unspecified location.

Iran's chief justice Gholamhossein Mohseni Ejei on Monday vowed swift trials for people arrested on suspicion of collaborating with Israel, as intense fighting raged between the two sides.

"If someone is arrested for having ties to and collaborating with the Zionist regime, their trial and punishment should be carried out and announced very quickly, in accordance with the law and given the war conditions," Ejei said, quoted by Tasnim news agency.

Iran on Monday urged Britain, France and Germany to pressure Israel to stop its deadly attacks on Iran as fighting raged between the two foes for a fourth day.

"Germany, France and England should have very clearly condemned the Zionist regime's crimes, especially against the Natanz nuclear facility," said foreign ministry spokesman Esmaeil Baqaei, adding that European powers should focus on "stopping the aggression" and holding Israel "accountable".

Iran urged the UN's International Atomic Energy Agency to condemn Israeli attacks on nuclear sites in the Islamic republic during an emergency meeting on Monday.

"We expect the (IAEA) Board of Governors and the Director General to take a firm position in condemning this act (attacking nuclear facilities) and holding the regime (Israel) accountable," said foreign ministry spokesman Esmaeil Baqaei during a weekly press briefing.

Israel said Monday it deported the last three remaining activists from an aid flotilla that attempted to reach the war-torn Gaza Strip last week.

"The last three participants remaining from the "Selfie Yacht" (flotilla) were transferred this morning to Jordan via the Allenby Crossing," the foreign ministry said in a statement, adding they included one Dutch and two French nationals.

Hezbollah has long been considered Iran's first line of defense in case of a war with Israel. But since Israel launched its massive barrage against Iran this week, the Lebanese group has stayed out of the fray.

A network of powerful Iran-backed militias in Iraq has also remained mostly quiet — even though Israel used Iraq's airspace, in part, to carry out the attacks.

Iran's Foreign Minister Abbas Araghchi said Sunday that the attacks on Israel will end once Israel halts its military campaign against the Islamic republic.