More details are awaited after US President Donald Trump said in a post that Washington was reinstating a naval blockade on Iran and would be reimbursed 20% on all cargo shipped through the Strait of Hormuz, the UN's shipping agency said on Monday. "We are aware of the post and awaiting more details," a spokesperson with the UN's International Maritime Organization said. "We have always been consistent on our stance on fees – IMO stands firmly against charging fees for passage through straits used for international navigation. There is no legal basis through which to introduce mandatory tolls simply to transit through a strait." Trump said in a Truth Social post the process would begin immediately, but did not elaborate.