US negotiators to return to Pakistan for talks as Trump repeats threat to Iran's infrastructure

We've just had an update from US President Donald Trump.

"My Representatives are going to Islamabad, Pakistan - They will be there tomorrow evening, for Negotiations," he writes on social media.

"We’re offering a very fair and reasonable DEAL, and I hope they take it because, if they don’t, the United States is going to knock out every single Power Plant, and every single Bridge, in Iran," he adds.

Warning there will be "NO MORE MR NICE GUY" if talks fail, Trump says these bridges and power plants will "come down fast, they’ll come down easy".