New Delhi, April 16 -- U.S. President Donald Trump said Monday the American military had begun a blockade of Iranian ports as part of his effort to force Tehran to open the Strait of Hormuz and accept a deal to end the war that has raged for more than six weeks.

Iran responded with threats on all ports in the Persian Gulf and the Gulf of Oman, taking aim at U.S.-allied countries.

At least two tankers approaching the strait Monday turned around soon after the U.S. blockade began, vessel tracker MarineTraffic said in a post on X.

The U.K. Maritime Trade Operations agency said the blockade restricted "the entirety of the Iranian coastline, including ports and energy infrastructure." Its notice to mariners said transit through the strait t...