United States President Donald Trump said the tallest bridge in Iran had been destroyed, hours after threatening to bomb the country "back to the Stone Ages."Trump had said operations would be intensified and gave no timeline for ending hostilities, drawing threats of retaliation from Iran and sending share prices lower."We're going to hit them extremely hard over the next two to three weeks The department did not give a reason for his departure, which comes as the US military builds up its forces in the Middle East.After Trump's address, Iran threatened "crushing" attacks on the United States and Israel, firing missiles at Tel Aviv.After strikes on the Iranian bridge, the country's Fars news agency listed several bridges in Saudi Arabia, Kuwait, Abu Dhabi and Jordan as potential targets for Iranian military operations.Iran also offered a competing vision for future control of the Strait of Hormuz, which carries about a fifth of the world's oil consumption in normal times but is now virtually closed.An official said Iran was drafting a post-war protocol that would supervise the strait's maritime traffic with Oman, though it said it was yet to begin negotiations with Muscat.Trump said the war could escalate if Iran did not give in to Washington's terms, with strikes on its energy and oil infrastructure possible