President Donald Trump urged civilians living in Tehran to evacuate the Iranian capital "before there is nothing left."

The president’s ominous evacuation warning came hours after the Israeli military told residents in some parts of Tehran to leave as it struck a state television complex in the city.

Markets are concerned about Iran's frequent threats to blockade the Strait of Hormuz, just as the US heads into peak summer demand season.

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.

President Donald Trump in about eight hours went from suggesting a nuclear deal remained “achievable” to urging Tehran’s 9.5 million residents to flee for their lives

U.S. stock futures slipped and oil prices rose on Tuesday, as investors were rattled by U.S. President Donald Trump's call for everyone to evacuate Tehran with the fifth-day of Israel-Iran fighting sowing fears of a broader regional conflict.

The strikes came after the Israeli military said it had carried out fresh strikes on Iran nuclear infrastructure sites.