What could happen if the US strikes Iran?

For three weeks, the world has been watching to see whether Donald Trump will order military strikes on Iran. The US military has been building up forces close to the Islamic Republic, including an aircraft carrier and several warships which President Trump has been calling an “armada.” Trump says he wants to do a deal with Iran, and the two sides appear to be talking. White House special envoy Steve Witkoff is expected to meet with the Iranian Foreign Minister on Friday in Istanbul. But Trump has threatened that if no agreement is reached, he’s ready to order US forces into action. Frank Gardner, the BBC’s security correspondent, lays out what could happen if talks fail, and Trump decides to strike Iran. He describes several scenarios that might have major consequences for the Iranian leadership, its people, the wider region and the world. Producers: Viv Jones Executive producer: Bridget Harney Sound engineer: Travis Evans Senior news editor: China Collins (Photo: Iran's Supreme Leader Khamenei. Credit: Iran’s Supreme Leader Office/EPA/Shutterstock)