Israel appeared to be expanding its air campaign on Tehran five days after its surprise attack on Iran’s military and nuclear program, as President Trump posted an ominous message warning residents of the city to evacuate.

Iran and Israel are exchanging fire for a fifth day, with Iranian media reporting explosions and heavy air defence fire in Tehran overnight.

An Israeli strike hit Iran's state broadcaster on Monday while the head of the U.N. nuclear watchdog indicated extensive damage to Iran's biggest uranium enrichment plant and Iran called on the U.S. to force a ceasefire in the aerial war.