Later Monday, Trump posted on his social media site an ominous message calling for the immediate evacuation of Tehran, Iran’s capital. He made the post while in Canada attending the G7 summit.

Five days after a surprise assault on Iran's military and nuclear sites, Israel appears to be expanding its air campaign on Tehran.

The warning came on the fourth day of the conflict, when the Israeli military claimed it had achieved air superiority above the Iranian capital and could fly over the city without facing major threats. The military has issued similar evacuation warnings for civilians in parts of Gaza and Lebanon ahead of strikes.

Iran fired a new wave of missile attacks at Israel, killing at least eight people, while Israel warned hundreds of thousands of people in Tehran to evacuate.

For two consecutive nights, people in the Iranian capital have been shaken from their sleep by the sounds of explosions.

Israel has reportedly carried out a pre-emptive strike targeting sites in Iran, according to Israeli media outlet Channel 12. The attack comes amid heightened regional tensions, with Al Jazeera reporting loud explosions in Tehran shortly after the strike. Axios also confirmed that air raid sirens were heard across multiple locations in Israel.

A news anchor was rushed off the screen at a state-run television station in Tehran when an airstrike hit the station. The broadcast was interrupted after Israel issued an evacuation warning to the area Tehran where the station is located.

On Saturday, residents in Tehran reported hearing explosions, and the Iran air defense fired nonstop rounds in the Pastour neighborhood. Precise casualty figures in Iran were difficult to confirm. But Iran’s U.N. ambassador, Amir Saeid Iravani, told the U.N. Security Council that Israel’s strikes in Iran had killed 78 people and injured 329 others.