US Central Command say more than 10,000 armed forces members, as well as warships and planes, are involved in blockade.

Centcom says blockade of Iranian ports to begin at 10am ET; Iran’s negotiator says ‘we will not bow to threats’; oil prices rise. Follow the latest news

Trump said Monday that the American military had begun a blockade of Iranian ports as part of his effort to force Tehran to open the Strait of Hormuz.