Israel's military says it struck a "communications centre of the Iranian regime", but Iran calls the attack a "war crime".

An Iranian state television reporter stopped a live broadcast when an explosion occurred an hour after Israel issued a warning to evacuate the area of Tehran where the TV studios are located.

Israel's air force achieved a "remarkable feat," said William Freer, a research fellow for national security at the U.K.-based Council on Geostrategy.

State TV says Iran will "attack infrastructure". The broadcaster adds that the military has ordered the evacuation of the headquarters of Israeli TV stations Channel 12 and Channel 14 in response to the attack on the state TV headquarters earlier.

A White House official said President Trump had decided not to sign onto a statement drafted for Group of 7 allies that urges restraint from both Israel and Iran, which have been trading attacks for days.

President Donald Trump is abruptly leaving the Group of Seven summit, departing a day early Monday as the conflict between Israel and Iran intensifies and the U.S. leader has declared that Tehran should be evacuated “immediately.

Oman and Qatar were leading efforts to begin ceasefire talks, while mediators said Iran was open to resuming nuclear negotiations if Israel’s attacks stop.

Oil prices climbed over 2% on Tuesday as Iran-Israel tension intensified and U.S. President Donald Trump urged "everyone" to evacuate Tehran, increasing the prospect of deepening unrest in the region and disruption to oil supply.

Iran has arrested dozens of people on suspicion of spying as fears grow in the Islamic Republic over the extent of its infiltration by Israel’s Mossad intelligence service.

Mohammad-Reza Zafarghandi said in an update that an Israeli strike on Sunday on Quds Square in northern Tehran injured 59 civilians and killed 12 people, including a pregnant woman. That attack also ruptured a main water pipeline.