Washington, April 8 -- President Donald Trump threatened Iran with civilisational destruction as the US attacked military targets on the country's key oil export hub, ramping up pressure on Tehran to reopen the Strait of Hormuz by his Tuesday morning (Tehran time) deadline or face massive strikes on critical infrastructure. Iran halted participation in ceasefire talks in response to Trump's social media post, according to a person familiar with the matter who asked not to be identified discussing private deliberations. Those discussions have been conducted through third-party channels, including Pakistan and Turkey. Mediators were scrambling to resuscitate negotiations ahead of the deadline, the person said. A senior White House official do...