There are rising tensions between Washington and Tehran. The US president has threatened to intervene against the crackdown on growing anti-government demonstrations across Iran. In a misspelt social media post, President Trump warned: "If Iran shoots and violently kills peaceful protesters, which is their custom, the United States of America will come to their rescue. We are locked and loaded and ready to go". 00:00 US and Iranian leaders exchange threats 02:31 Alex Vatanka an Iran expert and