Senior US and Iranian officials met on Saturday in Islamabad for the highest-level talks between Washington and Tehran in half a century as they sought to bring an end to their six-week war.

US President Donald Trump on Saturday posted on social media that the United States military has started to clear the Strait of Hormuz, and that all of Iran's minelaying ships have been sunk.

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View of skyline in central Islamabad with the Serena Hotel compound visible ahead of US-Iran talks

View of Islamabad's Serena Hotel ahead of US-Iran talks

LIVE: View of Islamabad's Serena Hotel ahead of US-Iran talks