Iran has fired on three ships in the Strait of Hormuz and seized two of them. The intensification of Iran's assault on shipping in a waterway crucial to global energy supplies comes a day after U.S. President Donald Trump extended a ceasefire but pressed on with an American blockade of Iranian ports. The latest salvos complicate already faltering efforts to bring the United States and Iran together for talks to end the war. The effective closure of the strait has already sent gas prices skyrocketing far beyond the region and raised the cost of food and a wide array of other products.