The blast occurred as Iran began a third round of nuclear talks with the United States in Oman. The cause wasn't immediately clear.

Four people died and at least 516 were injured in an explosion at southwestern Iran's power of Badar Abbas, according to state media.

At least five people have been killed and 700 injured in a massive explosion at one of Iran's key ports, state media is reporting. The suspected chemical blast took place at Shahid Rajaee, the country's largest commercial port, near the southern city of Bandar Abbas on Saturday morning.

Trump says he favors a nuclear deal with Iran but won’t hesitate to take military action if talks collapse, insisting he won’t be dragged into war by Israel — but might enter one by choice.

U.S. President Donald Trump this week said he is open to meeting Iran's supreme leader or president and that he thinks the two countries will strike a new deal on Tehran's disputed nuclear programme.

US President Donald Trump's renewed threat comes as Washington and Tehran continue talks over the Iran's nuclear program, with a third round slated for Saturday in Oman.