Tehran said it was responding to a continued US blockade of Iranian ports, calling it a violation of their ceasefire, while Supreme Leader Mojtaba Khamenei said Iran's navy was ready to inflict "new bitter defeats" on its enemies.

Iran’s supreme leader says that negotiations with America “are not intelligent, wise or honorable” after President Donald Trump floated nuclear talks with Tehran.

Some hardline factions in Tehran want to continue the war. Others see the Islamabad meeting as an opportunity to refashion relations with Washington.

Direct talks between the two sides lasted some 21 hours in the first meeting of its kind since the war began. But there was no deal to end the war.

The US will not be blackmailed by Iran, Donald Trump has declared, after Iranian gunboats attacked cargo ships in the Strait of Hormuz.

Failure to reach a deal throws ceasefire into doubt and raises questions about reopening the Strait of Hormuz as global energy supplies continue to be throttled.

Time is running out on a fragile ceasefire between the U.S., Israel and Iran, increasing pressure on mediators to get both Washington and Tehran back to the table for a second round of talks to end the nearly two-month war.